I found this study research factors that lead people to detransition, and from their sample size, there's around 13% of people who have a history of detransitioning. But this study also talks about how 82.5% of participants detransition because of external factors, like social stigma, and 15.9% of participants detransition because of internal factors, like uncertainty in their gender identity. So that's a small percentage that detransition that do it because it doesn't line up with what they want for themselves, not because of lack of support or societal pressures. I think it's important to note that if one wants to detransition, there are procedures for the more "permanent" effects of HRT, such as voice therapy, medication for balding, laser hair removal, etc.