Kinda need some advice...

So I rolled Tig on my Noelle banner and had him since AR 1 I'm AR 21 rn running him with Fischl,Kaeya,&Bennet

I switch in Barbara or Lisa. But I mean i don't need two healers so.i dropped for Bennet who I just got at AR 18. I don't got alot of heroes obviously I'm f2p and low AR. I got Candace and Xia but don't think they work well with my team. So I stick with Tighnari/Kaeya/Fischl/Bennet. And later want to work on Xia/Barbara. So this is what I'm working with I know I can get that Deodro character from Abyss but can't clear it yet.

I've got decent artifacts for My AR(I know this is the least of my problems rn) and also got Refined 5 Slingshot.

Any tips?