Adding incentives to play ALL survivors
Heard a very interesting idea from a known dbd streamer recently and honestly I think it'd be a great addition and easily possible to add. Passives.
If you're someone who has every survivor, every perk, and are just going through the motions now you have no real reason to play anyone other than you who visually want to look like considering all your perk choices are essentially the same. Why not add a reason to play other survivors? I rarely see anyone running around as Quentin, Tapp, Laurie, Adam , or Jeff (just from what I've seen). Add a very small, very miniscule, non-gamebreaking/unbalancing stat to each survivor based on their character to promote "playing the field."
Some characters are designed to run, some to hide, some to take a hit and keep going, etc...Stick a 1-3% increase to anything from vault speed, repair speed, healing speed, and so on to give people a reason to play as other survivors. Probably never going to happen but tbh it'd convince me to try everyone and build them according to what they're already good at.