Before all, I'd like it if you mention a source when a claiming something to be true.
Luckily for you I did the research for you;
https://jamanetwork.com/journals/jamasurgery/article-abstract/2779429
https://journals.lww.com/plasreconsurg/fulltext/2023/07000/regret_after_gender_a...
In short gender-affirming surgeries correlated with a 42% decrease in psychological distress and a 44% decrease in suicidal thoughts in comparison to transgender and gender-diverse individuals desiring such surgeries but not having undergone them.
It is also generally accepted that the regret rate ranges from 0.2% to 3%
PS
Transgenders or really anyone part of LGBTQ+ most likely face key risk factors for suicide.
These factors are summarized in: https://www.thetrevorproject.org/resources/article/facts-about-lgbtq-youth-suici...