My biggest pet peeve is when someone gives advice about audio, AND IT'S WRONG ahh
With a degree in Post Production (editing) and 10 years working in the industry for tv, my advice is...
Audio Mixer OBS:
Voice: -5db (THE RED ZONE IS GOOD, never get to 0)
Game: between -20db & -15db (Yellow)
Music: between -45db & -35db (Low Green)
People saying never to put audio in the red zone are flat out wrong. You want to avoid distortion, which is when it peaks at 0 and above, but your voice should be louder than the game.
Hope this helps!