Unfortunately, Douglas is neither a psychologist nor a writer.
The writing is long-winded enough for me and I could not figure out what the author is trying to say except the following words...
1. The only thing you can control is yourself.
2. All traders give themselves exactly what they deserve;
in other words, they alone are completely responsible for the outcome of their actions.
3. Try to adapt to the changing market
But he surely learned something from his bankruptcy, which is a precious experience.