You have stepped onto a very wide road. This question is very relevant for gambling. But I want to say that this issue concerns not only gambling. The inability to keep emotions under control is a problem in many areas of human life, it can be family, work, or business. Not being able to control your emotions can be a problem in life. Therefore, when a person learns to keep his emotions under control, he will not only have fewer problems in gambling, but also in many areas in everyday life
In many other cases, of course, someone who can control their emotions well is someone who is experienced in their field. as in gambling, beginners will find it difficult to have control and are more likely to play according to their emotions. Therefore, beginners make more mistakes when given several small wins and continue to chase big wins.
There is no special way to overcome this, everyone can control their emotions. but the process may be different.