I’m sorry you are still so uncomfortable.
Those stories of people who recovered sooooo quickly are often very exaggerated and misunderstood.
For example, I told someone recently that I started bowling, carefully, at 3 months. Their response was wow, they were impressed. Realizing I had given a misleading statement I described just how that went, that I only did one game, I was shaky by the end of that game, my husband and to put my shoes on for me, and tie them, etc. She picture me cured and bowling like normal. If I had not described my experience in more detail, she might have told someone else that I was bowling at 3 months and that person would have picture normal bowling!
I am 13 months now. I am beginning to see light at the end of the tunnel!
I did some sewing the last few days and it’s the best it’s been yet. I can get up and down from my chair easily, get up without pushing off the chair with my arms. That’s new. I can sit down with my knee bent normal, I don’t have to put my foot out giving my knee a lesser bend. I can stand at my ironing board preparing my fabric for as long as I want now. Twisting and turning in my little sewing room doesn’t bother my knee like it used to.
I am excited. It took over a year to do these things.

And I thought I’d never get to this point!
I will have to go put this on my thread as an update.
You have plenty of time to improve. Walking is good. Just take a short one. 10 minutes. Or not. Do what feels right for you.