It’s hormone related alas.
People reporting they have tons of hair are deeply unhelpful - would you post on a thread about poverty “oh I have plenty of money”? No you wouldn’t. Please bugger off with your “oh I have so much hair” stories, you are tedious.
OP, I fear the only thing that will really help is HRT, no use to the many women who are unable to access this treatment due to complicating factors (eg hormone receptive breast cancer). The majority of women who are affected are impacted by hormones and androgenetic aolpecia and guess what? There is no money to be made from this AND it’s a women’s health issue = result, even if you are prepared to go private, there is fuck all support, fuck all research, and fuck all care. Sorry it’s shit.
Compare this with say breast augmentation (something that men have a vested interest in) and the huge amount of money that pours in for research, info, advice, Providers, pfffft.
Bottom line, once you’ve reached the point of major hair thinnning, the medical industry is just not interested in you. Depressing but you neeec to find your own care pathway and fund it. It is shit.
NB: a small exception I found was a fabulous dermatologist (a fabulous black woman) who prescribed finasteride for a few years which was very effective). She was hard to find via a cosmetic doctor and has stopped working in England alas but continues to practice in Wales. She was great and one of the VERY few women doctors working in this field. Most are men and (a) unsympathetic and (b) charge 5 times as much as this excellent woman doctor. I can dig out he details if you wish.
Btw, FORGET asking the NHS on any help with this. Ten years ago they were so bad as to be comical. Only not funny, just atrocious. Now, ha! No way to get an appointment for anything, unless you open a vein prior to bring triaged. Not to jib at the healthcare workers who are trying so hard, but the NHS is fucked beyond recignition.