From what I know, there's pumping, and DHT cream.
I've heard the cream and pumping both work, or some people do a mix of both. Though, there are side effects with the cream, such as balding. I would have to say pumping would be the best option, since the cream is expensive and a highly controlled substances, and you can't buy it in the us without a prescription. I believe you need to order it online from canada or something along those lines.
Pumping is something that's pretty simple, and takes 5, 10, (20?) minutes of your day depending how often you pump. I've started pumping 2 weeks ago and I've already notice a slight growth. I'm also only 3 months on t so I'm sure that's a factor.
The pump is also around 60 dollars depending where you buy it from. You can always talk to your endo about the cream as well if you want to consider it.