Hey, I'm currently writing my master's thesis on Tumbler and I came across your post. Years ago, I was a Tumbler user myself, and nothing has changed in 10 years. I've been self-harming for 14 years.
What I think helped me get through it at the beginning was having a safe person. Everyone only told me what I was doing was wrong and I needed to stop. Finally, I met someone who simply listened to me. He suggested other ways to relieve the tension. He were there for me, giving me the opportunity to vent. So that's the first important thing, I think: understanding and non-judgment.
When I feel like self-harm, drinking cold water helps me. I also like to put on music and hum/sing something that's highly emotional. I often write in my journal during these states. And maybe conversations might be helpful, but I rarely want to talk at such times.
In such very bad states, minor self-harm does occur. Then I simply hit my body with something, usually around my hands. Usually, no injuries occur. But despite everything, I feel like it's a bit like addiction – it will always be something I can return to and do again. It's simply a familiar way of coping. I think it's worth considering this long-term, to teach people how to simply cope with stress.
In the long run, I think that improving my personal situation, having a supportive person, and writing helped me most. I learned to respond, be assertive, and I developed as a person. This is probably why self-harm isn't as common in adults. I think the solution may lie in teaching young people how to manage their own minds and situations, raising their self-esteem, finding resources within themselves and their surroundings.
Cutting itself made me feel somehow cool; I had something to care for (the wounds), something to look up to. I was proud of them, even though I had to hide them. This feeling of carrying a secret, of being hurt and broken ultimately appealed to me. Maybe there's a deeper reason here too? I don't know.
My research also shows that self-harm is often linked to other types of disorders – substance use and eating disorders. Therefore, all factors need to be considered individually and from a broader perspective.
I really like your idea and work. If you have any more questions or need help, let me know!
Thank you for this ask and good look with your thesis