You're in generally good shape as compared to my now two hair loss events. Thankfully my hair is recovering for the second time and looks generally "normal" but not to my satisfaction, I hope finasteride works for you, but being as that I'm in the same boat as you, I can tell you that finasteride did not work for me, and that it is now my very strong hypothesis that finasteride only really works to prevent hair loss, and does not do much to induce regrowth unless your body naturally is inclined to convert testosterone to estrogen.
I now know that the reason why I had recovered from very substantial hair loss in my late 20s because for whatever reason, my body was more readily converting testosterone to estrogen and thus in roughly about two and a half years, my hair went from awful and sparse to extremely thick, as thick as it ever was in my late teens and early 20s.
Endogenously plus or minus some tricks I can do with medications to increase my estrogen to induce growth, I am coming close to my limit in that regard. Not my total limit mind you, but it seems like without some serious outside intervention in the form of hormones, I'm not going to recover to the extent I fully want to.
And I hate to say it, because a lot of guys in our age range are worried about testosterone and maintaining that hard dry angular look, and if your hair is androgen sensitive, I can guarantee you that your skin is too and thus if you want to keep that look and reverse miniaturization, your chances are very slim. The estrogen that is required to induce regrowth either endogenously from finasteride interfering with 5AR, or exogenously will soften your appearance.
I have decided to take the topically applied estrogen route and that is using it in limited doses to directly antagonize and reverse miniaturization and provide the e2 that I now believe is absolutely necessary to induce strong hair regrowth. I managed to have substantially higher e2 levels when I was 30 and it did not give me gyno or severe weight gain, so I believe I can artificially induce that state again.
Hopefully finasteride works for you, but if it does not, realize that it's not the end of the road. I'm fully committed to managing the side effects of estrogen and going that route, I've done... well still doing the high-t thing. Got ripped, got big, shredded like a mofo, but honestly it's not worth my hair.
Only if your body takes the testosterone not converted to DHT and converts it into estrogen, because that's the only way to reverse miniaturization. I've done PRP, I've done so many treatments, I've done most all you can think of, and nothing, and I mean nothing either will work or work as well as estrogen, whether it's produced in your body or introduced topically.