As @will_steal_your_username pointed out, there are hair-loss treatments, but they can't reverse hair loss after it happens so you should act quickly if you're going that route.
I've heard that feminizing HRT can also cause some head hair to regrow as long as it isn't completely gone. But since you're enby you might not want to go that direction. I think even a small dose can have a pretty big effect but I'm not sure, you should ask a doctor if you're interested in that route.
You might also buy a wig. But I would seriously recommend not getting a cheap one because they always look bad, imo. It could be an option until you can afford hair transplants or whatever you decide.
Also, there are absolutely some women who experience baldness. It's not as common as with men, but it happens.
I hope any of this is helpful!
Oh yeah the beginning of that stage is really euphoric! You'll probably start to notice that random women in public will strike up conversations or just smile genuinely at you without quickly looking away. And men will start acting less friendly and awkward.