I transitioned in my mid-forties and wasn't a hundred percent certain that I was actually losing hair. At what point does a male hairline stop being JUST a male hairline and become baldness? With all of the other chaos in my life, I didn't think I could handle baldness, so I decided to see if I could do something.
My doctor prescribed oral Finasteride (topical Rogaine is toxic to cats). I'm still not sure whether it helped. I do know that it interfered with my transition some, although I didn't realize this at the time. I suspected that I would become more comfortable with myself, so I felt that the medication might buy me some time, during which I could come to terms with the possibility of real hair loss.
I'm over fifty now, and I'm definitely thinning in the front. But the loss is very slow; I've been on T for seven years, AND I am the right age for thinning hair, BUT I still have quite a bit of hair left there.
I get why you feel that your hair is your best feature. There was a time when I felt similarly. I'm short (around 5' 7", so short compared to most cis men), and I have a stocky build. I'm currently a bit overweight because chronic injuries prevent me from exercising, but I would have to struggle to stay trim regardless. My shoulders are narrower than most guys', my hips are broader than most guys', my hands are small, even my head is small. In other words, I'm not great-looking, and I'm going to become less and less attractive from here on out because I'm well into middle-age.
But you know what? Although I still have issues, I feel better about myself than I ever did when I had more hair. I've had to adjust, that's all. I don't know what your particular circumstances are; maybe you are overly critical of your looks. Maybe not. But perhaps you just need time to adjust, too.
I don't see hair loss in your pictures--the hairline looks great, in fact. The one shot of the top of your head may or may not illustrate that your hair is thinning; you may be jumping the gun. So don't panic just yet.
But maybe switch doctors...