i'm (probably) not as old as you are (>5 years on T/in my thirties) but i cannot imagine stopping testosterone would help you at this point

the target is on, essentially, "people who look trans" (so, including non-passing trans people, as well as gnc cis folks or folks who tend towards androgeny in genetics or hormones). we have always existed, and there have always been, passing trans people. part of our survival has just been... passing, and only engaging in intimate relationships with trusted people

you would, in my opinion (without seeing you), more likely "fail to pass" as a woman instead of as a man. you didn't really talk about this much in your post, beyond implying you've been on testosterone a long time, but if you pass consistently as it is...

holy fuck, NO, DON'T DE-TRANSITION!

presumably, you have facial hair, you might have top surgery, you probably have the muscular and fat distribution of a man! why would you spend probably two years, endangering yourself as you detransition, for something that will (hopefully) at least be tempered in four years?

if anything, my bigger concern is just staying supplied with testosterone until the end of the term. if i run out and start detransitioning, not only am i going to be depressed as fuck, but also i'll likely be in much more danger that way, especially 6/12 months in

(and i don't want to downplay the trouble that chenical dysphoria invites either, good mental state is absolutely a boon in surviving dangerous situations)

if anything, now is the time to figure out how to secure your testosterone supply. if your papers all have your updated gender, and your current supplier is on your side, see if they can adjust your diagnosis from gender dysphoria to hormone imbalance. at least on paper. otherwise, see about securing local sources of testosterone from your supportive community, or do some reading into crypto and finding an online source for it (which will always be around, albeit expensive)

i've also lived a hard life and i also would detransition if i had to, to survive. however, my assessment is that, given that i already pass completely, it would be a huge mistake to try to preemptively detransition. and honestly, i'm grateful for that. those of us who are earlier in their transition, or whose presentations lean more non-binary, have a much harder assessment to make

and, as fucked up as it is, we can use our powers as cis-passing men to speak up for those of us in more vulnerable positions. it does everyone good to have more of us in those positions of power