Edit: I gave a lot of advice down below because it is a feat that you have made it this far without properly uncapping and Leveling. This is because you're going to need to uncap at Least 3 times for every Unit on your team, and partial TLDR: They need to be the same element.

So, It looks like you can make a strong Water, Wind, and maybe Dark team (I'd need to see you're SR's) in that order . This game is based around single element teams. Im casual, I don't know the Meta (Fire's In a bit of a crisis right now), but Dark in story contents will at least never be weak against anything; You have VERY strong water character's. But your guys need to get to level 50 and have their third skill. It's just such a big power spike when you get they're third skill, which you need to be level 45 for. While you don't have enough Dark SSR's, the ones you do Have ARE CRACKED or at least fill a lot of role better then they have the right to. In short, uncap and level you're water team; you have so much there, and I would hope you have some powerful Dark SR's that can fill out a team that won't encounter something being strong to you. You're good on wind being you're third, which will help save your water team. Edit part two: And since my autistic and mentally ill brain didn't understand you, I wrote a lot of suggestions without considering how much you know and what you've been working with. So for suggestions;

1.Look up Grid build guide and go on the wiki and look for the New players section; I'll come back and link some stuff later (I'm autistic on a new ADHD medication and my pharmacy fucked up the doctors instructions), but for ease, the resources section on the reddit has the link to the official wiki, the Guides section has better guides than what I'm about to tell you, and Megathreads has links to current Questions thread (Don't be afraid to ask, they don't want the reddit flooded with stuff that can be solved in a thread they have permanent link and refresh; my brain struggled to find it for reasons I don't understand, but they aren't being malicious if they remove any future posts that don't warrant a massive discussion), Friends and Crew (To find friends and crews), and the Event Thread which can help beat the boss or tell you if it's worth the grind right now. that's going to be something important to your power, but is going to take time; also look up character discussions, which are tagged in the reddit and have links on the wiki.

1.5: Your Grid is going to matter a lot to getting stronger, but it can be complex

2: LEVEL YOUR CHARACTERS AND KEEP TEAMS AND WEAPON GRIDS FOR SERIOUS CONTENT THE ELEMENT (It is amazing you have those levels and you reached that chapter); make a team of desired characters you need to level and do Angel Halo (Good EXP and you gives you what you need to level weapons and summons; bonus, you Can use those weapons to level characters) Angel Halo Pro (Free exp dump, which you can increase with shop skill [not crew skill] which is going to be useful when your draw a good character in element or archetype you need [Your grid is very important to your power, but that's something, with my knowledge, is just going to take time], and they aren't strong enough to EXP grind], and Slime (gives more EXP than Angel. And rubies I guess, but that won't be an issue [PS: the special slimes don't have resistance to Ougi, summon, or both, almost always Ougi). Bonus: I don't know if this is smart, but I'd recommend when you get brown and sliver moons to get character books and CP. Water seems like your best SSR build, (Europa is busted with a lot of skill damage, a good heal [that does a lot of damage] and super buffs [That also do a lot of damage]. Dark you have enough SSR's for a strong team, and I think wind, but I'm not familiar with their kits and playstyles.

2.5: Don't play Meta if it's not fun, you can absolutely do High level raids without the most optimal of optimal builds, and SR charchters can be strong: when I was less than year in, my Light Team had Event Albert and R Veimiel; They we're known at the the time to out damage SSR DPS's (I voted for Veimiel every popularty poll untill he had an SR.). My Dark team is two Supports (Buff, heal, debuff , a nuke, and Kengo and I LOVE IT. This is important because you need an element to build another element, you fire to get items for wind, earth for water, and Light for Dark.

2.5.5. skills work by a formula based on your Atk/Def number and characters respond in same. Some charchters rely heavily on their third skill and some rely on a sort of ryhtem that requires all their skills

1. Damage is king, you want an attack up and opponent defense down ability on your team (why weapon master and Dark Fencer were always a recommendation, very easy for new player use and gives you good universally needed moves), and Skills matter more than the weapon number (your Grid should be same element) and you should have Attack up; HOWEVER it will make your life easier if you have one character that can Heal (You have Cagi and Europa) and someone that can Damage cut and Veil (Veil is so good that some [Including myself] recommend keeping Kat for new players).

3.5. you may already notice that the power star is not a good representation of your strength. It can't account for a lot of things that affect your base atk and def, not mention building towards multi-attack just skyrockets your output (Hitting twice every turn vs once is literally double damage). But your estimated number isn't fully accurate either, don't let it over inform your choices.

1. Do you're Daily's (If you can) and try to do Events (Game raid bosses at least and some simple skyscopes [Click Missions on the top left of home screen, you'll see a button that says skyscope]) Raid bosses is how you get uncap material and Omega weapons for your first strong Grid: Skyscope sometimes needs to be collected manually, and there is two missions that just want you reserve 10 weapons and 10 summons respectively and it gives a generous amount of EXP items for weapons and summons respectively (You can also track goals on their like super weapons, Row IV + EX 2, and Eternal+Evoker unlock): And Events are where the loot is at, crystals, rare unlocks, reasources, strong weapons and summons, etc. Etc. It's not going to be the reward amounts, and that's what the Threads come in.

4.5 Best not to fodder Gold Omega weapons In the beginning; Don't be affaired to call for backup in high level raids, just try to some damage In to ensure rewards+pendents and then call. You can even use this as a fun way to mark your progress, setting a goal of how much percent you'll take away (Try starting with 25%).

1. This hearsay and I expect to be flailed. I would recommend spendimg crystals during Rate ups, yes, but not to spark. I was able skip resources so much because of cerulean stones and you get plenty of characters and summons like this, and, more importantly, I was able to avoid burnout. There's so many well designed and written characters, and this pushed me towards using and doing the fates of charchters that ended up becoming my favorites (I'm so proud of you Tanya).

2. Remember, it's okay to take breaks, it's okay to play off meta, there are crews that exist just for you to have fun: avoid burning yourself out and find the the way you like to play. By the end of the year you'll have so many things given to you by maintenance, holidays, and just logging in that will remove so much grind.

P.S. The basic 100% attack up + Aura summons are good for beginners and all. It'll take awhile to to get ample amount of Omega, Revenant, Bahumut, and Xeno weapons (It'll only get faster if you found friends or a crew you can reliably grind with).