Focus on being present in the experience you're in, rather than what you might be missing out on. Since social media is the most prominent point of comparison, limiting its use is actually probably pretty useful for also minimizing feelings of FOMO. If you are around people you enjoy and you're grateful for, it will become harder for those feelings of missing out to come up. And if you realize that others also have those feelings, kind of puts things in perspective that no one is having any more fun than anyone else.