I tell everyone the best way to get better at BJJ is to actually do BJJ. The best way to keep doing Brazilian jiu jitsu is to make sure you have a good strength and conditioning program.
When returning from an injury, be smart. Your goal is to train for years. Train at the right intensity, avoid positions that feel uncomfortable, and choose the right training partners.
If you are doing the same thing from workout to workout category, lacking intensity, and failing to overload your muscles - here are some stimulating options to help you break out of your slump.