Relaxed hang
Hang from a bar with straight arms and let the shoulders go up.
3 × 10–30 s
muscle
From the inner side of the elbow down the palm side of the forearm to the wrist and fingers.
Close the hand and bend the wrist.
Your grip. A hang ends when these give out, whatever the shoulder can do.
Hang from a bar with straight arms and let the shoulders go up.
3 × 10–30 s
From a relaxed hang, draw the shoulders down away from the ears and hold, arms still straight.
3 × 10–20 s
From a still, straight-arm hang, pull until the chin is over the bar, with no swing.
3 × 1–3
Other structures the same drills work.
General anatomy, simplified. It describes a structure, not anybody's shoulder, and cannot say what is wrong with yours.