I learned about this word today too. It stands for 'Joy Of Missing Out".
You were thinking of buying a coin and later that coin dumps to oblivion. That's JOMO!
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.
Everybody at some point has experienced loss in the cryptocurrency market. It happens to everyone but that doesn’t mean that you should quit. There are also other better coins than the one you chose and I believe that if you invest in them you would make good profit the same way that you are making profit from investing in Bitcoin. Even while you are investing in Bitcoin you can still make the wrong choices and lose money.
Unless you are someone who have plans to invest for a long term and you are ready to go for as long as even five years to wait for the market to go through a bullish trend for you to make profit and maybe recover whatever you might have lost.