I'll shout out Clearspace[1]. They're YC W23[2]. I am in no way affiliated with them.

I find the app is very useful. I do find it still takes some discipline, but it adds enough friction into accessing pointless apps, that it makes a real dent in my doom-scrolling. It isn't cheap, but it works well enough that at the current price point, I will pay.

[1] - https://www.getclearspace.com/ [2] - https://www.ycombinator.com/companies/clearspace