Best advice I can give is STOP ROLLING and START TRAINING.
Find some guys you trust to work positions with you. When the position changes, the drill is over.
Obviously, if you can't pull your heel to your butt you can't pass the guard on your knees. And you can't recover guard by driving that knee to the inside, which limits working some traditional side control escapes and guard recovery. Most of your clinching style guards are gonna be limited as well.
Perhaps drill a position like deep half that requires very little knee flexion.