How to stop hair fall? (For a teenager)?

I'm currently 15 (almost). I've had Dandruff for about 2 years now and hairfall is a new issue. It started at the end of December 2023 and had never happened before. My hair has become so thin. It keeps falling out randomly. (Some people said it's probably due to puberty or winter but I don't know for sure). I have to mention that I have AN EXTREME amount of Dandruff too. Any solutions for this?
How to stop hair fall? (For a teenager)?
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