Hair is getting thinner, what can I do?

(Sorry if the flair is not appropriate)

Before my hrt I had good hair, it was not very dense, but it still had a good structure, it was already tight. Now after more than 2 years, my hair has become way thinner, you can see the scalp between the hair, which was never the case, my hair is also so thin that I don't have classic men's hairstyles, so I always have to improvise with a short midge.

I am 21, and especially in the front (not only at the corners) you can see it strongly, I have not lost any direct hair, but they are already extremely thinned. What can you do? I've tried any kind of shampoo and stuff, but nothing.

If you can't do anything, then I'll somehow get along with it, but it would still be nice if there's something