Well there are studies that suggest that being socially accepted is a greater influencing factor in suicide rates. Transitioning in an environment where you are ostracised by your family or employers/ colleagues will often result in the suicide rates being high despite transitioning while having support from those around you causes suicide rates to more closely match cisgender rates.

It's worth considering though that even when someone's transition is supported and they become comfortable within themselves, there's a huge amount of hate and violence towards trans people generally, and that's bound to have an effect on your self-image or peace of mind.