What to do after physical therapy ends?
What to do? Follow the PT recommendations and exercise.
A few years back I broke my arm near the elbow in two places. After a few weeks in a sling I began physically therapy. They were very knowledgeable and with their help I significantly increased my arm function.
When my stint with physical therapy was finished I had regained all but 14 degrees of extension of my arm. I was told that was a good result; the limited range would not hamper me much, and it would be hardly noticeable.
I resumed my strength training regimen as usual. It was a once a week full body workout. I would stretch occasionally, but this was not a regular part of my weekly routine. I limited my range of motion on the arm exercises to a pain-free range; I gradually increased my range.
A few months later I stopped by the PT to see if I had increased my range. They were amazed to find I had regained all but two degrees.

