I'm p much running on promoted 3 stars, and working on promoting my 4 stars as I go on. Not even touching my 5 stars yet since those are way too expensive for me rn.

You can literally beat anything (other than high risk cc) with 3 starts

stars

May I suggest the boy Eckogen?

Eckogen - YouTube

He has a "low stars all stars series" where he beats EVERYTHING with low rarity units

Yeah I did follow some of his strats and KyoStinV and even then there were moments where their strats go haywire due to some difference in stats.

Ahh yes,

Sometimes being too good hurts too

Specially when you have to do timing

Oyuki is always good too