FOMO is basically a pointer that your emotions are in control of your actions. As a trader you need to have a strategy which must play out for you to take a trade and if it dosent as planned then your Stop loss will be hit and you wait for next signal. when FOMO drives your action you wont have a reason for placing a trade which is not supposed to be. just ensure you have a working strategy, have a trading book, manage your risk and be able to defend your trades in relation to your strategy.