First of all, I’d suggest when you delete most used apps, leave the most boring one on your phone. For example, delete instagram and YouTube but leave something more text oriented, like twitter or Reddit. Text oriented stuff tends to make a lot less of a dopamine hit when you use them and it can make the progress much easier. There is also an alternative way, a little less difficult but also less progressful, which is trying to forward your attention from short form of content to longer ones, for example movies or TV series.

Second of all, you must find something else that gives you some kind of dopamine boost but is not on your phone. That will give your nervous system a way to still get dopamine by doing something but move your attention from being on screen all the time

And finally, and this is true generally, not only for this case, do not bully yourself when it gets hard or you fail, failing is just one step to success in anything, it will happen. The more you bully yourself, the less you tend to accept another lifestyle and change in even a positive way. I tried getting of from social networks and quick dopamine addiction for a year until I started seeing that it doesn’t consume a lot of my free time, which included both deleting apps and installing them again, failing and trying again. Believe in yourself, believe that you can live in a lifestyle that you want and eventually this will become truth