Methods to improve hair loss

First of all, what I am doing is.

Wash hair in the evening. Dry thoroughly, mainly with cool air.

Choose a shampoo with good ingredients if possible.

I'm taking biotin and collagen supplements.

It seems that the amount of hair falling out has decreased by about half compared to before. I don't know if the hair that is falling out has decreased in quantity because it has fallen enough.

My hair doesn't fall out as much, but it doesn't grow thicker.

Is it because there are no nutrients on the scalp? What should I do to reduce hair loss?