I had this exact problem and I found an app called ScreenZen, which is built on top of Screentime in iOS and you can use it to block specific sites and apps pre

I had this exact problem and I found an app called ScreenZen, which is built on top of Screentime in iOS and you can use it to block specific sites and apps pretty effectively. It just minimizes the app and doesn't let you access it. I am now using it to easy off some sites and I've set a couple of 7 minutes sessions per day and I've limited my time time considerably in the last month