There has been much speculation and resultant studies about whether there is a connection between social media and mental health. It appears that social media presents both negative and positive effects for the average user.
Fear of Missing Out (FOMO) seems simple on the surface, but it is actually a multidimensional and complex psycho-social phenomenon linked to our desire for interpersonal attachments and belonging.
Self-care isn't one-size-fits-all, you need to develop an understanding of what it is that restores you. And contrary to popular opinion, whatever it is, it doesn't have to be expensive.