In my experience, working on the triggers had the biggest impact. Yes deleting the apps helps a
lot, but so did removing the things that made me reach for my phone in the first place: notifications and badges. My phone is in do not disturb mode 90% of the time. In any case, I only allow notifications from WhatsApp and my bank. There are no feeds anywhere; not even the weather. I aggressively disable anything that calls for my attention. I add distance between me and the apps I check mindlessly, like Gmail. All that's left is Hacker News, and Reddit with no subreddits on my front page. Removing the default feed from these websites helped a lot.
Basically, picking up my phone is not rewarding anymore. I'm many steps removed from anything fun. It's enough to not think about it.