Advice for regrowing and strengthing hair?

Looking for any advice or personal anecdotes on hair regrowth and care. I've got thin hair that gets oily and have no clue how to care for it. My family all has thick hair and there's so much online. A little bit of context is I'm recovering from an eating disorder and all my hair is falling out, I'm currently getting help but miss my old hair so much and would do anything to get it back 😭