So I hear that it's only worth investing resources into 4+, so what do you do with the 3* use them to level or sell them or what?

As a beginner playa, you start w/ 3 star knights until you get enough 4 star and 5 star (which most will come from events)

Depends on you on what to do w/ them



I evolved my fave 3 star knights and the rest I didn't lvl - I keep a squad of them for special event raid boss events since they can't kill shit

I leveled them until I could replace them with something better. I think the highest level ones I have are about 36 or so (not evolved). They are still part of my very weak raid boss team as well although not the one I use the most.

I used to keep one copy of every 3* knight. But eventually i started to wonder why i should bother to waste so much of my knight capacity just for some collector reason. Especially since it isn't rly hard to get them anew. So i sold every 3* knight who was below lvl 40 and I haven't regreted it since then. Now i sometimes add one of those 3* again to my roster, when i feel like maxing ones affinity in order to get a FG.

I kept them all, but didn't invest a single manyu in them for ages. Recently however, I started to occasionally level them up again, since my main unit is (mostly) complete and leveled. We should get Nation Battles in a while, and they'll be somewhat useful again when that happens.

Same here. I got them all, maxed skill and equipment slot for all and leave them before I need them again for nation battles.
Now, I send every 3* dupe I got since I don't need them anymore for anything. 500 coins is always welcome after all.