I don't think there was a specific pivotal moment for me but rather a series of events that led to an epiphany.
All my life I've done everything exactly how I was supposed to. I got married, went to college- obtained 2 degrees (while also pregnant most of those years) I had children, built a career etc etc. my marriage went to shit and leaving it was a big traumatic event that led to stalking and physical abuse etc. but I wasn't jaded yet, I met someone new and we had a kid and I rebuilt. blah blah blah when the burn out caught up to me, I really had no one. Everyone was so used to me managing everything- the kids, the bills, all the responsibilities, and if I didn't or couldn't there was always something "wrong with me" over time I just lost hope in life and realized it doesn't matter what you do, it'll never be enough, no one will ever appreciate it and when you need help you can just go f yourself because how dare you?
Anyway, I've had suicidal ideation my whole life but the string of events where I was desperately seeking support and constantly hitting a brick wall eventually pushed me from ideation to complete hopelessness and burn out.