Desperate thin hair help

Any tips to on making your hair grow back? Come in thicker? I’ve always had thin hair but in the last 6 years or so it’s become so bad I don’t do anything but wear it up... I used that ogx stuff that they say is making people loose hair... I think that might be contributing, that and stress etc. I’m currently not using any products in my hair at all. Just washing with water, massaging/scrubbing the scalp. Taking biotin, and I’ve been trying to eat healthier and get in shape... I decided to start putting my hair in a less tense tie up... and I just want to cry... I didn’t know it was this bad... I need help 😞