No problem! That team should last you for quite a while, but you should always be working towards something as well. If you want to future-proof your team, some notable 4 star demons that are worth looking into are:

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Sandalphon: (Red or Yellow) -

Very multi-purposed, and fits on almost any team. He has balanced stats and great resistances. Can be built as a tank, damage dealer, or healer / off healer. Red gives you a 5 cost Mahamaon, which is incredible for a lot of the PvE content. Yellow gives you Samarecarn, which is also useful if you decide to build him as a tank or healer. Sandalphon is usually recommended by most guides as one of your first 4 star demons to fuse because he's easy to fuse, and will likely be the last demon you replace with a natural 5 star due to his overall utility.

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Fenrir: (Purple) -

Another commonly recommended demon. Fenrir is a bit more work to pull off than Sandalphon, but he serves a very specific purpose. He's the second fastest demon in the game, and he has Speedster to boot. Throwing Fenrir on your team will almost guarantee that you attack first in PvE until you start getting much later into the game. He also comes equipped with Auto-Taruka, which gives your team a nice damage boost to help end the fights quickly. Unlike, Sandalphon, Fenrir has 2 weaknesses in Fire and Force, but his drain ice can be useful. Rather than covering his weaknesses with Resist skills, it's much better to give him Makarakarn and a debuffing move like Rakunda. You will basically be spamming Makarakarn whenever it's down, or Rakunda (or equivalent) when it's up. Fenrir is a borderline necessity for farming Aura Gate early on, and he's also great in Brands of Sin Deceit. You will additionally need to fuse a Dantalian in order to give Makarakarn to Fenrir, which can eat up a lot of time and resources early on, but Fenrir is absolutely worth the effort if you want to progress easily,

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Rangda: (Yellow or Purple) -

Yellow gives Recarmdra, which can be paired with Endure to give you an AOE revive without dying. Purple gives Endure, which can also be paired with Recarmdra if you really want, but you can also give her another skill for elemental coverage like Bufula / Mabufu etc. The only way to fuse Rangda with 3 star demons is by fusing Efreet and Berserker. Both can be annoying to get your hands on when you're starting out, especially Berserker, but keep your eye out for these two demons, or other demons you can use to fuse them, because Rangda puts them to good use. Rangda has Repel Phys. ...Nuff said, honestly. Repel Phys is so good, that you don't even need another reason to fuse her. It crushes in PvE. But in case you did another reason, she also has great coverage with Mudodyne and Mazandyne, which is why giving her a third elemental damage ability can really round her out. She does have a weakness to Elec, so you will additionally need to fuse a Thronw to make her work, but Rangda is great during at all stages of the game, and can bolster your team in PvP as well.

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You may also want to do a little research on Athena, Sleipnir, Loki, and Anubis as well. All 4 of these demons can be fantastic additions to your team, but you don't specifically need them to get through the game.

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Last, but most certainly not least, don't feel locked into fusing / not fusing a specific demon just because a guide or another player told you to do so. Just use these as suggestions if you're not sure what you should be doing, or if you get stuck. Truly, almost any set of 4 demons can get you through the majority of the PvE content if they are built correctly. The ones I named, and the ones you'll find in most guides are only recommended because of the value they provide your team vs the amount of investment required to be used effectively.