I'll let you read all of the specific chess observations via the original linked post above, but here's an excerpted general observation which I think is also very relevant for any improving player (or person...)
The question was, “If you could talk with your 20-year-old self, what would you say to them?”I had two pieces of advice for my 20-year-old self. The first was: Don’t be afraid of failure. Before I was 20, all I did was succeed, succeed, succeed. (Except at things like sports, where I failed early and often. However, it is socially acceptable for a nerd to be bad at sports.) But three of my most formative experiences, the things that taught me humility and forced me to figure out what I wanted to do with my life, were failures.