With the explanation from OP on JOMO , Joy of missing out , when you change your your mind of a trading order and stay out and you the next hour you see direction of price against your earlier position that would have ended you in lose, you are likely to be happy for staying out.

FOMO as you know is fear of missing out. This is opposite of JOMO kind of. In FOMO , you enter an order hoping for profit rather than staying outside. Anyway in FOMO you may lose or gain depending on the eventual direction.