Fun fact: If you don't open a social media account, then you will most likely not spend hours on their apps. Sounds really fucking crazy, but it's true. I tested it myself!
I didn't go as far as deleting my account, but just deleting Instagram/YT apps from my phone pretty much got my reel/shorts scrolling to 0/day (I already had notifications off for years). And by just deleting apps on my phone, I'm somehow don't end up using them on laptop as well. I think phone makes it easy for brain to remember and keep the habit.
By using ReVanced[0] I have completely patched Shorts, adverts, and Comments from YouTube. It's even added SponsorBlock. I can open YT, watch a video, then close it again without all the attention-diverting crap that's usually present.
I'd _highly_ recommend it to anyone with an Android phone.