Maybe just stop using social media. If you're interesting your friends will contact you still. If you're not interesting, go get a hobby and become interesting.

Usually this site is the only place I care about but there's a presidential election in my country tomorrow. I'm not gonna stop using social media right now. Future of my country is at stake.

> There's no point in migrating to some perfect encrypted federated free software platform and being alone because everyone I know is still using Instagram.

If everyone went by that logic no one could ever stop using the social media sites they are using today. If you've found a good platform your best bet is to get people to use it in addition to the bad ones they use now and as more people join and use the better platform people could find themselves using the old ones less frequently. By enjoying and getting used to having the benefits of the new platform they could grow increasingly frustrated by the limitations of the older ones.

As long as the perfect encrypted federated free software platform is at least as easy to join and use as the old one asking a friend to add one more app to their rotation wouldn't be putting a huge burden on them.