Many people talk about changing and self-improvement. In fact it's a multi million dollar business. Although there ARE good reasons to change certain aspects of our lives (like healthier lifestyles, not being a douche etc), in reality it is pretty difficult to change character traits.

Instead of attempting to correct our weaknesses, why not focus on our strengths? Do more of what you do well. Structure aspects of your life to suit your strengths. This is a newer approach in the field of psychology. The so called "psychology for sane people". It's a vast subject and has applications to our whole lifestyle, but I'll discuss a few ways relating to poker.

Find an approach/plan for poker suiting your personality
There are many personality tests out there, and most people have a good idea of their character strengths and weaknesses. Reflecting back on my poker career, there have been times when I was playing a form of poker, style, that didn't suit my personality. If you hate variance don't play HU PLO. Of course you COULD try to improve your tolerance for variance, but that can be hard. Just avoid the game because it doesn't suit you. Same goes for finding a playing style, level of bankroll that suits you. Maybe you hit a wall with poker because you aren't getting the maximum from your strengths in the particular game/stakes/mental approach/theoretical approach.

Don't review hands you lost!
Most players review hands they lost. This approach has good intentions. We want to correct mistakes and not lose money in the future. However, I think focusing ONLY on losing hands gives only negative feedback. Often people review hands after a downswing. But you can also learn a lot from hands you win. Next time you have a downswing try this exercise.

Review ONLY the winnings hands > 25bb. Take notes on
- What lines worked as bluffs
- What lines worked for value
- "Good" things you did. Stuff like losing minimum when behind, thin valuebets, reading someone's range correctly, picked good 3 barrel spots etc.

For the next 10k hands, focus on the good things you did during the downswing. Don't add any crazy/fancy new plays to your game. Go back to the bread and butter plays that have a proven history of being +EV. As confidence increases then slowing add new plays. As a general note, you should understand fundamentally why/how certain aspects of your strategy make money. This exercise re-enforces that point.