like when we play a dice game, we cant simply bet and roll the dice at the default settings or multiplier which is 2x because most of the times we can lose in an instant but a skilled gambler will modify the setting and use a different multiplier to lessen the risk of losing and to greatly increase his chance of winning but no matter how you follow your start, losing is sometimes unavoidable and the same thing can happen to a high skilled trader, they can experience to lose too even if they are not completely gambling or relying on luck.
All of us know the difference between the gambler and the trader but we sometimes relate one another because they have similarities.
That is what the regular good trader would do as well. They would arrange a strategy that would perfectly fit for their goals and characters and they would focus on that but not only do that forever, but also improve that and change it according to market requirements of the day as well.
A bad one will find something (like martingale) and then copy that and try to do that forever until they lose all of their money and then complain that the game is rigged. A good trader also knows, and not predicts by the way literally knows, that there are losses in trading and anticipates that, which would result with you having a bit of a good return eventually.