My goal in trading has always been to be able to do it without stress, anxiety, fear, hesitation, worry, or anything else that would impact my health or my ability to trade long-term.
Having recently achieved this life-long trading goal, I'm now certain that improving trading skill is, for many traders, not the reason for losing.
I developed my own trading strategy from scratch over the course of about 7 years and, after it was done, I honestly believed I had the best system in the world and that I was among the most skilled traders in the world. My skill and incredible accuracy at finding entries and exits, however, didn't lead to actually executing those trades. And no matter how many times in a row I was right (while not taking action) I could never convince myself in my heart that I was a good trader and that this next one would do anything but lose...probably. So I continued on with anxiety, stress, or fear over the possibility of loss (even very small loss).
There are three parts to success. Skill is the first. If you're not capable, you won't succeed.
Desire is the second. If you don't want to succeed you won't even show up to the table.
The third is optimism and the belief that your system and your ability to use it are "probably right" instead of "probably wrong."
I think a better question for traders to ask is "How can we improve our trading optimism?"
Now I'm trading without fear because, after a loss, I am able to still believe that I'm usually right and that this loss just happened this one time.
In the past I had fear over entering a trade because I believed that I'm usually wrong and that a recent loss was a sign of a future trend of losses... even if it was my first loss in a while or came after 5 or 6 "would-be" wins in a row (had I acted on them).
From what I've read on ET, I think many of you actually have winning systems and, to some degree, can accurately analyze the markets at whatever level you're capable. I think optimism, and belief in good things to happen rather than in disaster to happen, is the one thing that would allow everyone to actually follow their system the way you do during virtual trading and finally get the results your back-testing promises. It's possible that improving your skill is not giving the results you want because a lack of skill is not the problem. The problem is a pessimistic explanatory style of both good and bad events in trading.