From my experience, here are 4 reasons I discovered:
1/ Lack of Discipline— a) Not sticking to one strategy, b) not respecting your trading rules, c) not sticking to your plan.
2/ Lack of knowledge—Inadequate understanding of the market, trading strategy, financial instruments, and fundamentals can lead to poor decision-making.
3/ Not having a mechanical trading system—This leads to emotional trading. Decisions driven by emotions like fear and greed rather than rational analysis result in significant losses.
4/ Overtrading—Taking many trades will affect your decision-making ability and lead to poor decisions.
If there are other reasons why traders lose money, share them with me.
You have made an extensive and proper touch on very keys drawbacks traders are faced with leading to trading losses with, some little or no profit experiences.
I am mostly interested with the 4th reason, over-trading, as aside greed and impatient to wait for the right opportunity to showcase clearly before jumping in a position which has been one of many reasons traders lose out, there is something I refer to as
responsibility-pressure that force some traders to overtrade. Finding oneself under many pressing demands that requires money to solve them had made traders overtrade making them vulnerable to series of losses due to how they get into the market based on emotions of the moment and with a pure lack of discipline and use of functional strategy.