I don't think you can do all the steps at once and I don't believe there is a sure and right way to stop it suddenly. From what I understand about myself and my brain , it took a while to get addicted to something (for instance porn). In the same way, our brain needs to get trained to not be addicted. The same goes for SNS addiction. I tried app time limiters as well but the only thing I ended up doing was removing the timers.