Most people agree that Social Media is broken and that we need to find new solutions

Solutions for what? Algorithmically driven "content", made by people who don't care about the material they're churning out, as long as it gets them in front of eyeballs and lines their pockets?

The problem with social media, tech, and most of our other ills in society, is capitalism. Greed. MegaCorpX isn't building a social platform so that you can have a community. They're doing it to make money. You're just a cog in that machine for them, but they make YOU feel like you can be the star of it, and exploit you in the process. Along with it you create parasocial relationships that make literally no one happy, a fertile platform for mobs and harassment, constant self image issues, FOMO, doomscrolling, etc. etc. Not to mention giving a platform to bigots, white supremacists, nazis, etc., and feeding those ideologies, all while pretending like you have to let them be there because of "free speech" or "town square/public commons/whatev"

Social media is a MASSIVE net negative, and the answer shouldn't be "how do we make new ones after the old ones collapse?", but rather "how to we move on from the idea that social media is necessary, and just let it die?"