More earnable cosmetics
Basically, I think that the game should have some kind of cosmetics for the characters more than the rift, event or the shop itself. I saw on Twitter some cool concepts about it, and I like those because are objectives that takes a long time but that you do without even noticing even.
Some examples that I could find are "End Game Collapse cosmetics". Basically, for the survivors is simple: "Safely unhook 50/75/100 teammates in the EGC", and for the killers "Hook 50/75/100 survivors in the EGC". Each part would give you a cosmetic piece for the character that you're using (ex: you unhooked 50 survivors safely with Feng, so you recieve an EGC shirt for Feng. 75, a EGC legs piece. And with 100 an EGC head piece for her. The same with other characters). The point of this type of challenges is that it takes a while, but that you can do without even noticing (like those challenges like "sacrifice X survivors" or "complete a total of X gens".
It could be something more simpler, like doing an Adept Achievement and you recieve a body recolor of that character (wich rewards people in the game for doing an achievement more than just have the achievement).
Or maybe could be something with devotion level: Each devotion level that you have gives you a devotion point, wich you can spend on a character and you'll recieve a devotion cosmetic piece for that character, so you can spend 3 devotion points on a character to have all devotions piece of that character. This could make devotion levels something more intresting and useful.
Tell me what you guys think and tell me if you have more ideas for this, maybe the devs could do something like this so people have more motivation to play with more characters and spend more time in the game :D
Wish you all the best