Similar to how we can mute users, a way to turn the volume up or down of people so that the quiet users can be heard more easily while the louder ones can be lowered could be a good idea.

I have a friend whose voice is rather quiet and it's hard to hear her when surrounded by other people, namely those that are incredibly loud and overbearing. Muting should really be a last resort and I can hardly go around muting every other person on VRChat.