Many traders enter into a tailspin of emotional trading and losing money after they hit a string of winners. The reason this happens is because they feel confident and euphoric and forget about the real danger of the market and that ANY TRADE CAN LOSE. The key to remember here is that trading is a long-term game of probabilities, if you have a high-probability trading edge, you will eventually make money over the long-term assuming you follow your trading edge with discipline. But, even if your edge is 70% successful over time, you could still hit 30 losing trades in a row out of 100….so keep this fact in mind and always remember you never know WHICH trade will be a loser and WHICH will be a winner.
The problem is that this is where traders are most likely to succumb to overconfidence bias. It's not uncommon for traders to complete a winning streak and then believe that they can't get anything wrong in the future. To believe this is of course unwise, and is only going to end in failure. Make sure you always analyse your trading sessions and look at your wins and losses in detail.