(Question) Is treatment effective for already advanced female hair loss?

I used to have thick hair, but over the past few years, it seems to be getting thinner and the amount of hair falling out has increased. I am stressed because the crown of my head looks particularly sparse, and my parting feels like it is getting wider.

At first, I thought it was a temporary phenomenon, but I'm worried because it hasn't gotten better over time.

My hair loss has already progressed quite a bit, so I'm wondering if starting treatment now would be effective.

I've searched online and it seems there are medications, scalp injections, and various procedures, but what is actually the most effective treatment for female hair loss that has already progressed significantly?

Are there any people who started treatment when their hair loss was severe and saw improvement? I am curious about how long the treatment took, as well as the costs and any side effects.

I would appreciate reviews or advice from those who have had similar experiences. Thank you.