It's so hard to stop. For us, it's lessened greatly with therapy and trauma processing.
For those who deal with a more direct form of SH, I've heard this pen is very helpful. Also, feel free to leave any tips in the comments.
https://symphonylightart.com/products/recovery-pen
https://www.redbubble.com/people/GianuSystem/shop
https://www.patreon.com/gianusystem