Husband's hair loss

In my 30s, I took medication and managed my health diligently, but since turning 40, I've been cutting my hair almost bald.

It's been about 8 years since I cut my hair, but only the crown area has hair that is coarse and baby-fine.

It's okay to wear a hat in daily life, but it's difficult when attending a funeral or wedding because you can't wear a hat and have to wear formal clothes.

Will I grow if I take medicine again?

Are there no other options besides transplantation or a wig?