what do you mean by i'm not doing brs this year:

• fire emblem au
• persona 5 au
• overwatch au

other tropes i like:

• "cannot-spit-it-out"/"we've been best friends for 100 years but everyone thinks we're dating"
• fake dating
• friends to lovers
• ghosts, the paranormal
• life after death aus
• memey, silly things where one character gets dunked on, preferably kuroo
• modern fantasy

there's a lot more i'm sure but these come to mind first