I found an incredibly simple solution for this. Screen time in iOS can block specific websites and apps installed on your device. Set harmless time limits - 5 min for instagram. 2 mins for Reddit.com etc.

Ask your spouse or a friend you trust to set screen time passcode. You can’t bypass it and you’re not going cold turkey either or losing an important utility like Safari.

Doom scroll all you want in 2 mins then it’s locked for the day.

I have succeeded and it’s been 3+ months.