An acronym: the Joy Of Missing Out.
The idea is not to delight in skipping the things you could be doing instead, but rather, to take joy in the things that a younger you would not have considered worth doing:
Like reading a book by the river.
Or going on a slow and pleasant hike.
Or skipping a rad adventure to sleep in and meet a friend for coffee.
Embracing a shift from doing as much as you can fit in, to doing what feels right, even if that means doing “nothing”.
A younger you would have considered it a waste of time.
Not because it was, but because you had yet to discover the JOMO.