I did something like this for a couple of weeks recently. I call it 'no idle screen time'. Any activity that involved using a screen (phone, computer, or television) had to have a purpose. The purpose could be simple such as messaging friends, finding an answer to something I was curious about, or simply looking at the weather forecast. Usually it would be work related.

Benefits became clear almost immediately. I got more actual work done. I suddenly had way more free time than I imagined. I renewed my library card and started reading again. My focus improved. I actually started actively listening to music again (rather than just having it on in the background). I got more exercise. I took the time to prepare better food. A certain low-level sense of anxiety that had become all too familiar simply disappeared.

I did slowly regress. It started with watching a movie or show in the evening, that sort of thing. Now, here I am writing this comment. Probably time to give it another go.