Can I not use minoxidil?

I've been losing hair gradually particularly in the middle part, on temples and hairline with very fine and thin hair. I've really low ferritin levels 9ng/l and vit D is low as well my derm has suggested me to use minoxidil 5% and supplements My mom has thin hair and some hair loss overall on the scalp but no widening of middle part so she does not have AGA. I have learned that low ferritin can also lead to hair loss that is similar to FPHL I don't want to depend on a lifelong med