What you are doing is "self-limiting" which is not very effective. The devil on your shoulder will always fight this - "don't tell me what to do!"
The wanting to not doom-scroll should be intrinsic. I know that right now, for obvious reasons, it's easier said than done.
a) Make your feeds more worthy and less attention grabbing by blocking anything that isn't one of your specific interests.
b) If you make good use of your time, you'll find doing stuff more interesting than scrolling.
I've written about this too: https://thisisjam.es/reflecting/on-information-diets/