(Concern) Thin hair and lack of strength

I'm a woman, and I don't think my hair was like this when I was very young, but my hair is now extremely thin and lacks strength. It's so fine that even after washing my hair, it quickly loses volume. Also, because the hair itself is thin and weak, it falls out very easily when I brush it. Moreover, when I get stressed or don't eat properly, I lose a handful of hair at a time. I used to have some hair loss, but since my hair quality is like this, the hair loss seems to have worsened, which makes me sad. Are there any people who have made their hair thicker later in life? I think if my hair were thicker and stronger, it would fall out less.