A unique event would be nice
most events just change game style but I would love if there was some new event where instead of a small variation in gameplay its entirely new, like a new killer or a mix of all killers, possibly the appearance of the entity itself, new win objective, different amount of max players, new items/killer items with a secondary. All item found within the trial(obviously doesn't save for sake of balance), new maps and new status effects
And preferably make the killer AI, hot take but if its AI you wouldn't need to balance for both sides and it could just be a breath of fresh air)
Just rambling but imagine there's is a killer that is a manifestation of the entity and essentially and it manipulates the trial's and just entertaining abilties that would be fitting for said trial, and the win condition for the survivors is to destroy the manifestation of the killer and trial before death, by either(just giving ideas)
-seals
-hexes/boons
-relics (cleanse or use them to uniquely fight)
-something interrelated to the killers and their power in dbd now
that's all rambling tho,