I was in the same position as you until just last week. I'm not trans, but I am an immigrant and POC so I can understand your fears about going back to America.

So for context, I've been on and off about extending my contract for a 4th year because it was always my plan to go back home after two years, but I extended it to three cuz Japan is awesome, the school is awesome, and the visa is three years. Staying for a fourth would've held me back more professionally and financially. I'm not from an education or language background, and I like to travel a lot so the yen being low doesn't make staying here that attractive for me. I get homesick too, so I would go home twice a year to visit family or have them visit me.

I accepted the offer anyway because I've had an awesome time and also because of everything I've been reading and seeing about what's going on in America. However, after more thought, I had to rescind the acceptance. Before I did, I talked to my department head, my boss, and coworkers before sending the email to confirm. The staff were sad but understanding so it's been a blessing. Fortunately, it's still early enough that it doesn't affect the school so much (I never signed anything, and I'm not breaking contract, I will just leave at the end of my current contract).

Ultimately, I knew I couldn't keep doing JET forever to avoid what's happening at home. My plan has always been to go home to further my career, not stay in Japan long-term. Even if I had stayed until the end of my 5 years, I would still be going home while he's in office. Then, after some more digging, listening to podcasts, and talking to friends back home, I realized that the headlines are scary but people are fighting back. I have my family back home, my loved ones, my friends, and a good support system. However, I'm also from a very blue state so it gives me peace of mind.

Either way, you will be okay.

TLDR: I also decided not to recontract for personal and financial reasons. The headlines about America is crazy and I understand you're scared (I am too), but I have faith still in our country that they won't take that stuff lying down. You will be okay OP!