Pain long after surgery

I had total reversal replacement surgery on my left shoulder in Nov 2020. It seemed to be going well for a while. Now it hurts constantly with a severe sharp pain in both the front and back of the shoulder. I've had the Sprint system placed in the shoulder for 60 days, I've had an Ablation and Steroid shot for the pain. Nothing has worked. Does anyone have a suggestion as what might be the next step?
Thanks.