Hi, my suggestion is to stop taking anti-androgens, assuming that you are taking them, and to just take estrogen and progesterone. That will elevate your testosterone levels a bit (E will still keep it lower on its own) and you should be able to get it up.
I should point out that if you are working towards becoming a biological woman, having no penis but rather a vagina is the end result, so the problem will come eventually, unless you want to be in the middle, which is okay too.
My thought for the moment is to stop suppressing your T levels. I know that is okay, at least with pellets, as I discussed this particular topic with my endo at the time.