Unfortunately the amount of groups on Facebook is nowhere else to be found, especially important for people who move/travel a lot. Not to mention the majority of events & co often only is posted on FB.
Still i dont miss it and i never felt i should get another FB profile. Even thought i dont had one the last 4 years.
What i am trying to say is that you most likely wont even know how irrelevant FB is for you life as long as you hold on to it for whatever reasons.