When profitable traders notice that the market is moving in their favor, they open even more trades not fearing that the market will reverse direction. WHen the market is going against them they quickly close the trade instead of hoping that the market will reverse direction. This keeps their losses minimal and their profits maximal.
The unprofitable/losing traders do the opposite; when they have a winning trade they quickly close it and take the little profit for fear that the market will reverse direction. When they have a losing trade, they leave it to run hoping that the market will reverse direction and they wont take a loss.
if you look at the trading account history of a winning trader you will notice few high profits and many little losses. For a losing trader you will see many big losses and few little profits.
Before you start trading on a new account, you should envision how you want your trading account history to look like, ideally it should have few huge profits and many little losses.