Find the glaring dysfunction
Most injuries can be traced back to poor movement somewhere along the chain. The sooner this is addressed, the sooner it can be resolved. Willing an injury to go away unfortunately isn’t enough.
Stimulus to an area should be incremental
An area you’re rehabbing will only become more resilient gradually. It’s helpful to think of it like you would strength training – would you start maxing out a muscles capabilities on week one of a strength program? Then why would you when rehabbing something specific.
Time alone doesn’t fix injuries
At all points of rehabilitation you are able to do something, if you’ve just had surgery this might mean you can only do isometric contractions. That’s ok, do those until you can do an eccentric, then do a isometric in the stretched position and so forth.
Progress isn’t always linear
This is particularly true for tendon rehab. You can have days where it feels like the injury has regressed. In these cases, look to see how the pain has been trending across the week not how it feels on a particular day. Just because you have pain doesn’t mean it’s not improving.
Keep moving and be creative
Just because you are inhibited in one area, that doesn’t mean you can’t train another. Ask people for advice and explore other training modalities. You’ll likely find there is more than enough upper extremity bodyweight exercises to use when your lower body is doing rehab exercises.