@TheVorticon hey
I can identify with bits other have already said.
The thing that helped me the most to stop was actually not trying to stop, but instead just focussing on other things. Like @tyme I was addicted to it, my life revolved around how and when I was self harming. I worked with a great therapist and a great behaviour practitioner, and my psychiatrist helped a lot too.
Filling my life with things I loved and enjoyed and finding my own purpose for my life helped me a lot. My purpose was art, in creating beauty instead of destroying myself and everything around me.
Turning my focus from "i have to stop harming" or "i wont self harm today/this week" or "i have gone x days, i cant give in now" to "i will try my best to accept myself today, and find something beautiful in my world, even if i cant see it in myself" or "if I do or dont today, at least I'm still going/trying" I was taking it a day at a time, not expecting anything from myself, and just doing what I could to get me through each moment as best as I could. Slowly the desire, and intrusive obsessive thoughts to hurt myself began to fade and other things were able to fill my mind.
Im sorry if I said too much or thats too long. As tyme said, everyone is different, finding what worked for me isnt going to work for everyone, and what worked for a lot of people didn't help me. Be open to many possibilities or a combo of them. I found it wasnt just one thing, but a process and one I will probably continue to go through a long time, but I am happy to acknowledge that it has been a long time since I engaged with sh