Going to write this anonymously as someone who has went through a serious narcissistic collapse 5 months ago. All I can say is that the collapse is the only, and rare opportunity for a narcissistic to begin real change. It’s like reaching the bottom, same as when alcoholic ruins his life and only then begins to change. I felt like I reached my own bottom and there was nowhere to hide anymore. There are lower bottoms to reach but that was enough for me. I was going to therapy before the collapse but after that went even deeper. If a narcissist has enough self-awareness and a willingness to change, as painful as it is, it can be a gift in disguise. I’ll also add that narcissism is a spectrum and beyond a certain point, a full-on NPD is just incapable of change.