There are a few to be honest, but it really depends on what your issue is. (btw I’m going to link out to the post on the site that talks about this in more depth). For me, an issue was knee stability and lack of hamstring and glute activation (I was/still kind of am very quad dependent). To get my knees back stable (one would always move inward when I squatted).

Banded squats for my knee stability and depth in the squat which helped with squat depth (hamstring and glute activation for me)