I noticed that the biggest problem of all traders is impatience.
Do you know that not every day in trading is equal and actually most profits came from certain days in the year which if you missed you will lose a grat portion of your gains.
As an example, here's a screenshot of my copy traders where you can notice how one day difference leads to 3x profits.
You won't win every day, but you need to catch the most important days of the year.