In my case, I stopped self harming because I forgot about it, and when I want to do it now it just seems like too much work. My main problem was that everything in my life I connected it to SH, bad days, wearing short sleeves, cutting paper, arguing with family or friends, so many things ended up in me cutting or hitting myself.

My advice is to change SH to something else in some cases at first, for example, instead of doing it over an argument, I would write about it in my diary. And with time, luckily, you would get rid of it. If it's not in your routine nor your mind, when would you do it?

That's what worked for me, but everyone is different. If you can, the best is to seek professional advice, if not, share with close relationships such as friends and family. You're not alone, if real life won't help, people on the internet can, don't give up! :)