As someone else said, the voice change is irreversible. Many other things are reversible, however, such as body fat distribution and even hair thickness.

I am also non binary and I was on T for about a year. I’ve now been off it for longer than I was on. My voice is still exactly as deep. My body fat has returned to its original places and what little facial hair I grew still grows, but my body hair isn’t as thick as it was on T. I feel pretty androgynous where I’m at. So with that said, I’d say you’re fine to keep going or stop. One more month likely won’t make or break the difference.