So I hope I can offer some thoughts on this being pre-transition. I think a lot of the activism benefits those who are going through transition and those that transition and remain visibly trans. The reality is that those who are cis-passing have a little bit of protection against the anti-trans crowd (TERFs and religious zealots). Pre-transition, I probably come off as weirdly involved in trans discussions on social media (mostly twitter). None of my friends have said anything and I have some plausible deniability in that I have always been passionate about social liberty in general.
As for afterwards... I have plans up here in Maine. I plan on going back to school either after or during transition to become an LCSW. I won't be a huge advocate in public but I like doing the work behind the scenes. I had an experience with a therapist when I was 17 and they were clearly not equipped to handle my trans issues. My goal is to help people like me so that no one has to go through what I have had to go through with gender dysphoria.
