Forex is a good profitable business. Sometimes successive earnings can make a trader overconfident and he thinks that he knows everything and that when reality happens when he starts increasing lot size. To get a big profit but it's really greedy and greedy is a curse. This is not something that makes us more confident. This depends on the nature of the person. If someone makes $ 100 per day and he is not too confident and if someone does not make a lot of $ 20 to $ 30 and he is more confident. it made him lose big.