Isolation work e.g pec decs/flys, machines (hopefully your gym has some decent hammer smith machines or similar... lateral Raises (nothing to heavy)
When I had my injury I found body weight push ups a great exercise to finish on, despite it being a push exercise with your hand positioning you can make it feel “natural” and not fixed.
Main thing is so listen to your body when trying new things any pain/weakness re-arrange your form or move on.