Thin Hair .. No idea what's causing it PLEASE HELP

[Yousra M]

Hi there,
So about 3 years ago my hair had been falling out a lot, then I went to a dermatologist and he prescriped anti hair fall serum and Biotin and Bepanthin pills
Now it hardly falling out .. But still is not getting thicker, and some spots have REALLY THIN HAIR that my scalp shows it looks terrible really and depressing though I am on a good diet and I;m taking Biotin supplements and Vitamins
So I went to see another dermatologist about a month ago and she told me I had androgenic alopicia and wanted me to use monixidil, and I'm really against that so I didn't take her word and I went to see another doctor
He requested some blood works
They all came back normal (I guess):


Anyway he saw them and said everything was okay and prescribed topical anti hair loss serum AGAIN, and something tells me they just wont work and I'm so sick of trying different things and I'm so depressed from the way my hair looks
I want to know what's wrong with me and what is causing all that ...