Many people fail in trading atimes because they lack the ability to access, evaluate,and examine the market situation at that time.They are only focused on putting money in it,and won't care about checking whether the time they want to invest in the market is the appropriate time or it's a wrong timing.
As we all know that trading is something you don't just rush to invest your money in,it is something you sit down to analyse critically,and and have a proper check to see that if you are putting in your money,it isn't going to go in vain.
if he does that, then he's the type of person who makes an investment then forgets about it and checks it out in the long run. However, this trick is quite risky and tends to lose if we don't check it in a while.
However, it's all a matter of how they choose assets to trade and how they trade them. It could be that their strategy or technique is wrong, or they chose the wrong trading asset. However, there are many reasons why people fall into trading, but the most common is a lack of knowledge.