Quit using it. Let's go back to the way the internet used to be, y'know with instant messaging and a multitude of cultures that have their own ecosystems. Let's stop consolidating all of this information and wealth in the hands of people who don't give a shit about what makes us different (unless it sells an ad).
As the number of people that can freely access the internet grows, you see them focusing around a single social media platform. That's because social media strongly benefits from centralization, it's easier to talk to family and friends if you don't have to manage fifty different accounts.
The idea that there was a 'multitude of cultures' before Facebook is just wrong. There was the main social media platforms and a bunch of niche offshoots. That's why this is such a tricky problem to fix because even if Facebook vanished tomorrow, eventually there would be another platform which absolutely everyone would circle around.