You not really need to quit trading because you lost your profit once. Try to hold your coins for a little bit longer till the value increase again. You can still work on campaigns while waiting for your coins to increase its value or rather build a mining hardware and earn coins passively while waiting for the market price to increase again.
I could not agree more to take some break before trading again from a big trading lost. This is to free our mind from being disappointed. It is also a good way to think hard where did you go wrong on that previous trade and what you can do in the next trade - because we really either win or learn in traiding.