When I had a bad ankle break I was sent to a physio who gave me brute force exercises that hurt.
I went to my chiro who gave me DNS exercises . They seemed too simple but gave the same results with no pain.
I got back into windsurfing after 6months ( flatwater). I was hobbling around on the land but I could sail. I was getting some sharp pains at times. The chiro said that was good as it was breaking up the scar tissue and realigning it as needed.
A few years on and I hardly notice the ankle. It gives the occasional sqwark..

I do work at it with ongoing stretches and keeping fit.
Mine wasn't as bad as yours but a year or so later my chiro admitted she is amazed at what I am doing and that the ankle was " ugly".