The problem isn't really that you can't stop - you *can* stop, you just don't because the apps are literally built for this. The algorithms deliberately show you the stuff that triggers you the most because it keeps you on the platform longer. It's not your fault, but you have more control than you think.
Start by being honest with yourself: when do you scroll the most? Right when you wake up, during your lunch break, in bed at night? Make yourself a concrete rule: like, no phone until 7 pm, or keep it out of your bedroom altogether. Delete the news apps from your home screen - if you still want to keep them on your phone, hide them in a folder. Sounds simple, but those extra two seconds of friction actually stop you a lot of the time. On TikTok you can unfollow or block specific accounts that just push depressing stuff.
The key thing: replace the time with something else. You can't just delete the craving for stimulation, you have to redirect it. A book, a podcast about something that energizes you, or just get outside - whatever works. After a week you'll already notice your stress going down. And you'll realize the world doesn't fall apart if you don't hear about the latest crisis for a couple of days.