Smash the tissues where the triceps start at the posterior shoulder and place your hand behind your back and lay on  the ground and work the border of the scapula with a lacrosse ball or something as well. I am a huge fan of turkish get ups and even half get ups to work on reclaiming stability of the shoulder and getting some time under tension without having to change shapes. Just make sure you don’t allow your shoulder to dump into internal rotation during the transitions.