Yes, the psychological aspect in trading greatly influences the results. For example, on a demo account, the influence of psychology is minimal, because here we do not risk our money. But on a real account, a trader may experience fear, excitement, euphoria or a desire to quickly recoup losses, which can negatively affect trading and you need to learn to cope with it. Even if you have a profitable trading strategy, but you do not know how to control your emotions, you will not be able to trade profitably.