conditioning by self-Hypnosis, mega dosing on oxytocin and then withdrawing abruptly, and a-HIIA inhibitors as far as chemical solutions. Increase testosterone levels to promote impulsiveness and inner convergence of capacity for inner aggression. Also successful (fatal) suicide which is rare, is possible but everything has to be set up so that when the stars align it's like lock and key. Have a ready to go CTB kit, and remember failing to plan, is planning to fail.
The obvious ones would be gaba a agonists, alcohol and BZDs beans combined with potent opioids you can get on the dark net and the liquid nitrogen method.
Just off the top of my head.
Hopefully it doesn't come to that but, if it does, see you on the other side. Hope you find your peace.