It's a good one,
We all made mistakes last year, but what is more important is learning from our mistakes, is not just about listing out our mistakes but it's about trying not to repeat it again
You learn more from trading out if experience and mistakes, what your mentor will teach you might not be that you will use at last, you will have your own experience and out of filtering and select you will end up with what is better for you
I think when it comes to trading, there will be times where you might repeat your mistakes for some reasons so I guess the best thing to say is to "lessen" the times that you commit those mistakes because there no perfect trader out there. Only efficient ones where they're making more profit than the losses that they're getting. I agree with what you said that we all make mistakes, but we should learn from it, and make less mistakes this year.
Always, always be better. Learn from your trades whether it's a win or a lose, formulate a strategy that works for you, stick to one strategy at a time, and journal all of your trades using that strategy. From there, you will be steps ahead of those other traders out there who are still losing more money than they make. We all make mistakes, but experience will teach us how to be better traders. Sure at first, we will lose money, but overtime, as we learn more and gain more experience, the higher the chances we are to make money.
Always remember, 90% of the traders lose money. Please, don't be one of those people.

Be on the other side of the coin.