I read your opening post but not the replies that followed, sorry, not disrespectful, just no time. In my opinion & experience, the sooner the diagnosis the better. If you understand yourself & why you are how you are, have any mysteries solved, have any "solutions" ahead of you, then there is hope. Personally, I went through a shocking period of grief, (not depresion, real grief). I can't explain it, but it was like mourning myself. What my life could have been. Who I could have been. But then the understanding- it might help with accepting yourself or quietening your inner critic or getting out of shame spirals & make you feel less alone & find a new community. I think I know myself pretty well but I can't even put a ballpark percentage of wanting to CTB is due to being so neurodivergent, it's so tangled up with living "wrong" my whole life.
I do know for me, earlier diagnosis would have been life changing, I just don't know if it would have been life saving.