I've also been unhappy with my screentime so here is my first entry. I spent an average of 2 hours and 54 minutes on my phone last week. That was almost 9 hours on Safari, which is mostly scrolling Reddit for something that seemed interesting. There are specific entries for Reddit as well at 4 hours, but I don't have the Reddit app installed so I'm not sure how that factors into the Safari time.
There is 7 hours on the Zwift companion app, which won't change because that goes with my bike training.
After those apps things trail off fast.