Avoid the injections. See someone who understands training and also has a certification in KBs and can teach you real arm bars and turkish get ups and presses. There is likely some reworking of how you are using your shoulder that is not being addressed that you could spend time on and work it out. Particularly learning to use your lats and teres major and create better rotator cuff activity through grip, traction and compression (farmers carries and the arm bars, get ups, crawls, etc..)