Give people your number. Text, call, make actual plans to hang out and put them in your calendar. Also it may seem annoying, but you have to tell people you are leaving the platform so they know to reach out to you else-how. Take the initiative to be the one to reach out to build the habit of actually catching up, rather than passively consuming life updates via “content”
The dirty little trick of social media is locking you in via the relationships you are trying to sustain. It’s hard AF, but once you’re out, you’re out!