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.
I do think having your phone in another room helps tremendously. I fight every morning to not take my phone into the bathroom for my morning ritual and waste 15-20 minutes of dooms scrolling.