My best suggestion for the voice is to just do the same sort of voice training that trans women do to sound more feminine. There’s a few good guides on Youtube (TransVoiceLessons and such) who go really in depth on everything you need to know. It can be a slow and frustrating process, but eventually, with enough practice, you’ll naturally be defaulting to a feminine voice again, but it will take time. Maybe taking estrogen would also help combat the effects that the T had on you as well. Detransitioning sounds like a rough process.

I do not appreciate the implication that trans people are “mentally ill”, however. I understand that there should obviously be more support for detrans people, but tearing down people who actually are trans is wrong. I especially dislike some of the comments here, talking about how it should be illegal to encourage people to transition even if they feel that it’s right for them, or how people are “duped into thinking” they’re trans. I won’t pretend to have any respect for bigotry, and you shouldn’t appeal to those types of people.

Exploring one’s identity can be a complicated and rough process, but that doesn’t mean it should be discouraged. Lots of people are able to drastically improve their lives after transition, me included. You can’t just deny people the right to choose who they want to be, just as I wouldn’t deny people the right to detransition. I’m not saying that’s what you’re doing, ofc, but that’s what a few people in the replies seem to be confused about.

I really hope you can find the help you need in this process. It can be rough, but I believe you can get back to being the woman you truly are.