https://en.wikipedia.org/wiki/Dihydrotestosterone +
https://en.wikipedia.org/wiki/Hair_follicle
dht inhibitor "zinc" topically in hair is the first line recommended for male pattern hair loss if it was exactly your problem, and don't use any other dht inhibitor it cause irreversible depression and sexual problems, btw zinc do the opposite
now just increase your experimenting speed, there many potential therapy