No you should not stop trading, that would be the worst decision that you will make. How would you regain those 40% loss if you quit trading, you need to win back that money. Losing momey is just a part of being a trader, now you have learned some lessons sp you would not do it again next time. Trading gives a lot of profit it just needs a lot of patience in holding some coins because not all coins are successful especially those coins that are not that famous. But as time goes by the value of it will rise. So in order to get that money back just continue trading