Emotions are one of the biggest barriers to success in trading. Not only beginners can't control emotions, many times it is seen that many experienced traders lose millions of dollars while trading. Whether trading short-term or long-term, there are always risks involved in trading and managing emotions is very important. So I think this point of emotion control is very important to get the desired result in trading. Because I myself still fail to control my emotions while trading.
Unstable emotions or psychological states certainly have a cause, whether it is because the trading strategy is not as expected, or suddenly the market trend decreases due to some scattered FUD. There are many factors that make psychology unstable and overflow emotions so the trading plan that has been made does not match what is expected.
and having more than one trading strategy is quite useful when the first trading strategy fails.
The first point discussed by the OP about the trading plan includes doing good and correct trade management. Without any management then trading can not run perfectly. Must do financial management, and risk management and build good portfolio management.
Like the tips given by Crypto COBAIN about Portfolio Management.
You can learn it and adjust it to the type of market capitalization Large, medium, or small.