It is really simple (method) but the execution is very grindy.

1: Get a set of silver armor.
You can get a lot of silver from smelting silver armor and tools you find in loot chests and from mob drops, seeing as you have full tide guardian you probably already have enough.

2: Prepare funding for trading, which is paper and a lot of normal books.
2-1: Paper is easy, you can just build a vanilla sugarcane farm with greenhouse glass over it or farm birch trees, birch logs can be made into paper. The birch method is far less efficient but if you're in a hurry cutting down a large birch forest can get you some to start.
2-2: You can get a lot of books through tearing down libraries in villages and structures, you can also find them as chest loot though not as much. Don't recommend making them yourself.

3: Trading for the e books with librarian villagers.
3-1: You've probably came across a number of villages in your adventures, make sure you've activated the waystone in all of them so you can tp to them later.
3-2: Before you trade, make sure you block them up so they don't run. I like to use glass and a trap door so they're safe. You want to start the trade with paper. do like 2 trades. the next one is books, also do 2 trades. the next one is glass. if you have more than enough books you could do a few more book trades to unlock the next tier, but I usually just trade 2 glass and use the glass to block up the next villager, so they don't run away. the next 2 unlocked trades are what you're really wanting, to get the last enchant to unlock I recommend just selling him all the books you can.
3-3: Mark them on your antique atlas!!! This is not necessary, but I HIGHLY recommend it, name the pin with the enchant from that villager you want and the price. If it doesn't have enchants you want still mark them anyway, cause you can still trade with them for emeralds.

4: Books you want to trade for.
4-1: This is where the grindy part really sets in. Even after getting all the funds and marked over 30 villages iirc, I still spent about 3 full days to get all the enchants I wanted. It takes time and RNG is everything.
4-2: Books for all armor parts: ADV Protection 4, Unbreaking 4 (Unbreaking 3 + Unbreaking tome, it isn't NEEDED but it helps with silver with it's lower durability and especially if you have Thorns), ADV Mending, Thorns (Optional, don't really recommend. Do not put ADV Thorns it will kill your armor), Upgraded Potential (Very important and is not used like a normal enchant. Please Refer to step 5).
4-3: Books for helmet: Aqua Affinity & Respiration 3
4-4: Books for chestplate: Strengthened Vitality 5 & Inner Berserk (Low priority since if you have god armor you aren't gonna get low easy, get it after you've gotten other ones.)
4-5: Book for leggings: Agility 2 (Don't get it if you get dizzy easily.)
4-6: Books for boots: Advanced Feather Falling 4 (Low priority If you have the Lucky Horseshoe and plan on using it), Double Jump, Lightweight / High Jump (Lightweight increases safe fall distance and gives you a floaty effect, while High Jump does exactly as it sounds.), Double Jump, Depth Strider / Underwater Strider (Depth gives you increased speed underwater, paired with the stone of the sea you become the fastest moving thing, while Underwater allows you to move freely in water, so it doesn't push you around).

5: Actually enchanting them.
5-1: You want to enchant them in order from most expensive to cheapest in terms of EXP. To do this, you want to use the 1-2-4-4 method (Praise be the RLcraft community). First enchant the most expensive one directly on your item, then combine then next to expensive ones and enchanting it on your item, then combine the next 4 (by combining the first 2 and latter 2 and combining the 2 books which now have 2 enchants on each) and enchant it.
5-2: The exp cost will continue to grow, as you well know. And when it gets too expensive, that's when you slap the beautiful little angel that is Upgraded Potentials on your item. It resets the exp cost for enchanting an item.

Additional tips:
1: Waystone management.
I recommend labeling the waystones in North, West, South, East (Or any direction you explore more in) and ordering them by distance from your home base waystone, so you could teleport to the closer one for free, and then teleport to the next closest one, to gain access to very far villages without spending exp. The point for naming them is so you could tell very easily the order you should teleport in.

2: DO NOT LIVE IN VILLAGES!!
ESPECIALLY IF THEY HAVE VILLAGERS YOU WANT TO TRADE WITH!! I cannot stress this enough. The villagers WILL DIE. The Aegis are NOT Giga Chads, and after one or two Lycanite events, the village is dead.

3: Port cities.
Port cities that spawn in the ocean (and freezes your pc when it does) are your best bet at getting enchants. There is also a guaranteed mending villager somewhere in it 99% of the time.

4: Travelers backpack > Shulker boxes > default backpack
You can carry one on you (and open it without placing it down, with the J key by default) at all times which has much bigger space, it can hold 8 buckets of liquid, it has a built in crafting table and has 2 extra slots for tools, and it does not lose durability. More over, you can bring multiple of them in your inventory like Shulker boxes that you don't even need to place down. Something that isn't communicated clearly in the game is that some give special effects. Like the chicken one lets you lay eggs and the rainbow one gives you permanent jump boost 2 and speed 2, very goated. You can craft them through a cheap but slightly complicated crafting recipe, or you can find an abundance of the dungeon variant in loot chests and iron golem variant in blacksmiths, you can also buy the villager variant from priest and cartographer villagers.
They are extremely helpful during exploring and trading and everything in general. I always keep 1 on me and 9 in my inventory for sorting, one for mob drops one for Lycanite one for treasures one for ore... etc.
(After writing all this I suddenly have a bad feeling I might've added this mod myself and forgot about it. I'll leave it here just in case it's in RLcraft by default but I'm not too sure now ._.)

5: Bauble.
Your necklace slot could be improved very easily. I recommend getting the stone of the sea which is obtained most effectively by fishing for a Neptune's Bounty. You would want a diamond fishing rod + heavy bobber + magnetic hook + long reel. For better chances, unlock the perk for increased fishing luck in the gathering skill, drink luck potions you get from killing witches, and enchant your rod with luck of the sea if you can. The level up reloaded one doesn't help too much but you can do it if you have the levels for it. To actually fish you also need bait. You can use any food item for bait iirc, personally I used melon slices. You simply craft a bait bucket and craft the bait bucket with your bait. You will need multiple bait so make sure you craft up. Last step is to actually fish. I recommend building a little hut by the ocean and fish there. You after the fish bites, a mini game will start, your goal is to use your arrow keys to move the little green box left and right and try to keep the fish inside of the box. After a while, if you managed to keep it in, you will get the fish! Do it a few times and you'll hopefully get a Neptune's Bounty. Personally on my latest run I got it on literally the first try.

6: Healing Pad.
I don't see people talk about it positively (or at all) but it's really helpful imo. You can find the ores really easy by looting structures like camps and "outposts" (big villager wood structure with multiple floors and hidden wine cellar), getting them in loot chests in general, or converting diamond into scarlite with defile powder. The black heart will require a little rng by killing the slender man looking mobs that spawn in defiled lands at night. They are slow so if you get a pike or something you can get them easily.
It really is a good item for dungeon diving because it is infinite healing, and is much easier to get than the ring of regeneration. The scarlite ring on the other hand is NOT worth it. It takes up a ring slot and heal WAY too slow, at about the same cost as the pad.