I guess you have to consider what is important to you. I am 10 years hrt with half of that post orchi, I am able to get an erection and still have ejaculate when i orgasm, however if I wanted to top I would need to use something like Viagra. As long as you are willing to get an erection you shouldn’t have atrophy, I made the choice to let myself atrophy for about a year and when I did get an erection it was horrificly painful. Use it or lose it is a valid phrase in this case.
Getting semi-frequent blood tests and talking with your doctor to get a dosage that works for you in the long term is probably the best approach.
Much love and support to you
based trans comrade shared the newest tdstr with me: https://yewtu.be/watch?v=dYwO2pewSvA
its so good