Any tips for strengthening hair??

My hair falls out SOOO much and I used to have thick hair but now it’s so thin.

My diet is good, I take iron supplements, I don’t over wash or over brush. I do usually have my hair up in a tight ponytail or bun but that’s because I need it up for work and also hate my hair in my face but I’m gonna start minimizing that.

Any oils? Products?

My hair is coming out at the root, so it’s not because it’s dead or simply breaking off. It’s gotten so thin over the past couple years so I’d appreciate any advice!!