I’ll throw those homebrews over the table:

Increased HP / Decreased AC
Advantage being given by high ground & backstab
Surfaces Effect

I want to add one more homebrew that is gamebreaking. Max range of a ranged attack being 60 feet. If Eldritch Blast/Longbow/whatever caps out at 60 feet that means any creature in the game can dash from the frontline to your squishy casters.

Particularly rogues/any NPC that can dash as a bonus action can go from maxrange to stabbing your wizard in the same turn and that's a huge issue.This nerfs ranged characters big time and makes them never be safe.