

I was in a similar spot at the beginning of my transition. Visible M and thinning up to a few inches back. I am now just over a year on HRT and my hairline has improved significantly. I still have the M, but its much less pronounced and the thin parts are filling back in nicely.
I also had major dysphoria about my hairline, but now its way better and I barely think about it anymore. The way it works as far as I understand is that damaged hair follicles will repair themselves but destroyed follicles will stay destroyed. When you start T blockers the damage should stop getting worse right away and then begin to recover slowly over time.
“Why don’t you walk down to the end of the room? Over by that vigor tester machine there.” - Doc Mitchell, Fallout New Vegas