How could I increase player retention?

Well, I only going to add about 5 more kits and be done adding kits. Then I am going to add variants.

Kits are more of play styles (like brawler being a melee character, lunge being a glass canon, etc), then you can get items that will change the kit to your favorite play style.

Example: lunge is all about being aggressive and getting in the enemies face, but maybe instead of the lunge, you get an item that makes you go invisible if you hold still. You are still an ambush character, but in a different way.

I will probably need to do this.

I am adding tons of satisfying effects (better kill sounds, the sound gets better the more kills you get, hit sounds)

I already fixed it, but the patch will roll out in the next update.