Suggestion:
Add a UI for your buff ‘slots’, showing your max number of buffs and how many empty ‘slots’ you have.
I.e. this person has 6/8 buffs active.
Reasoning:
The buff limit mechanic alone is incredibly unintuitive. The max number of buffs you can have also changes based on various factors (token, class, rank, daino), so it is hard to keep track of what your max buff limit is, and it is hard to determine how close you are to reaching that limit before your buffs start getting overridden.
I believe this simple UI change will make things much more intuitive (anyone unfamiliar with the buff limit mechanic should get a pretty good idea of it’s existence just by looking at the UI), it will also make it easier to manage your own buffs.