This is my first time seeing that acronym, however I will have to say that never happened to me, for most of the time I have been only interested in bitcoin, now there was a time in 2017 in which I got interested in altcoins as well but since then after losing a little bit of money I simple went back to bitcoin and since then I have not looked back, so unfortunately, or fortunately I do not know anymore, I have never experienced JOMO during my whole time in this market.