There’s a therapeutic exercise I like that may be applicable (if you’re interested)

With a yoga block flat on the hand of the affected arm, gently move the hand/block in an inward/outward motion, as if you were holding a pizza box and trying to serve pizza to everyone around you while only moving the hand/arm. To “lock” the upper arm in close to the body and only perform this with the lower arm/hand may get closer to the rotator cuff if I remember correctly.