I recently came back to using RSS feeds and it feels great. The problem is that many websites don't maintain their feeds properly. Broken links, missing content and whatnot.. I guess nobody ever uses them aside from weirdos.
The actual solution is to invite your neighbor over for dinner.
The actual solution is to volunteer at a retirement home.
The actual solution is to join an amateur sports league.
The actual solution is to take an in-person group class in a subject that you find interesting.
Not bad. It's probably how things should have been, but that boat has sailed long, long back.
Point is, efforts to make decentralisation and independent content creating, hosting and sharing should go on simultaneously with other social steps that you have enumerated. Neither can replace the other.