My solution to this problem was to have my phone permanently on silent. The logic being - there was nothing so urgent 25 years ago that couldn't be solved by an asynchronous answering machine message checked once a day; why do I need moment to moment updates now.
Nowadays I'd probably use a tool like yours. My partner is going through legitimate withdrawal symptoms after two years of short-form content addiction. Turning off all notifications was one of the first things I did for them.