At your age, and non-aggressive loss (and natural regrowth from cessation of accutane, likely due to stress/Telogen Effluvium) I wouldn't hop on anything just yet. Like a few have said, I would just keep an eye on it. If I were you, I would just give yourself a bit more time to see what happens. You might stabilize around the point you are at now. It's also possible you might lose just a couple millimeters, but it might stabilize naturally. If you notice a pattern going farther back, then there will still be time for you to regrow any losses. The important thing, which you've already done, is become aware and monitoring it. The other thing is, you don't know the exact role of DHT, T, or even E in your previous losses. It's possible the accutane affected one of those hormones, or a combination of those hormones, in a way that escalated its effect on your follicles for a temporary period of time. You have virtually perfect quality hair everywhere else, so it's also possible you may not be very sensitive to DHT. Some people like myself with only hairline thinning have follicles there that seem to be more sensitive to T. So I wouldn't jump the gun on a systemic 5ARI just yet. If you are unhappy where you are right now though, you could try some things like zix, minoxidil, stemoxydine, setipiprant, castor oil, dermarolling, fluridil. Those don't have systemic effects on your DHT/T/E, and have worked for many who don't have aggressive loss.
