Prevent things that are painful for a minimum of 30 times. If you keep provoking your pain, it’s not likely to recover. A corticosteroid injection (“cortisone shot”). This may present short term pain reduction but would not “cure” tendinopathy. You can find some problem cortisone may well weaken muscle mass https://www.theorthopaedicandpainpractice.com/what-are-some-shoulder-pain-treatments/