Somehow erase the concept of social media from the brains of humans and make it impossible for them to ever conceive it in the future. I have no problem with the internet in general or smartphones, I just believe platforms such as Facebook, Instagram, Twitter, Tiktok et al have done more harm to society than good. They're also predominantly inane trash and have caused people just to become even more self absorbed and narcisistic than they ever were (or at least allowed them to express it in ways that wasn't possible before which is just as bad).
NB: I don't consider internet forums to be social media. I'm using the term in it's original meaning back when Facebook, Myspace etc came in to existence. At that time forums and chatrooms were very much not seen as social media.
I'd also very much prefer that the internet wasn't predominantly about selling stuff. Back in the early days if you used a search engine looking for "Bankok Hilton" (for example) you'd get a couple of results giving it's telephone number and address etc, now you''ll get 200 pages of sites trying to sell you a room at the hotel.