Everyone likes to have a New Years resolution. What is your trading resolution this year? Happy Trading into 2019!
Jocularity aside... and as my biggest failure isn't about "knowledge and understanding"... but more akin to "inadequate discipline"... I'd suggest we all strive to be more disciplined. I hate to admit the number of times I've lamented, "I could/might have caught that if I'd been paying closer attention". Paying "close enough attention" is much more difficult than it sounds...
When you have played the game well too long, the game gets very boring and you lose opportunities, how about learning a different part of the game you never done before?