1. Settings —> Screen Time —> App Limits
2. Make your App Store/Apple ID password something needlessly complex and give someone else the paper with it on so they need to read it to you over the phone when you need it.
3. Send a screenshot of your app usage to a third party every week and if you exceed limits get them to donate some money you give them to a cause you hate in your name
4. Put your phone on grayscale