Burnout is real. It happens. What about using your obviously quite advanced skillset in a slightly different way? What about finding a place or two where you could teach art to people who want to learn about it? That might inject some new meaning into what you are doing. Helping others. Also, I think you should march on down to that theater and any others in your area and make an inquiry. You never know. They may be unhappy with their current situation. They may need help due to workload. Their current art people may be about to go back to school or move or have a baby or whatever. You don't know if you don't inquire. And I have found that the universe is often kind just when I think I have no shot. Just some thoughts.