Having only read a few of The Sequences, I may not be the best suited, though I may have the perk of having an immersion level similar to those who also have not read The Sequences, and thus be able to come up with a title that more closely appeals to that mindset. Since you're going to be competing with self help gurus in a genre about better living through better thinking, how about "The Key to Success: It's not just Confidence". I wouldn't discard making reference to some mathematical concept in the title. A contrast like that is aesthetically pleasing in some ways, and in other ways it can be intriguing enough for people to try reading the summaries, like "Bayesian Rationality: Better Living Through Better Thinking". From there, you could make reference to some amazing things like the German Tank Problem, and hammer home the implications that the reader could also do amazing things. Failing that, here's some swings in the dark.

Thinking about Thinking about Thinking

The [Theory and Practice of] Not Making Mistakes

[Instinct]: A Voluntary Action

Mind over Matter, Mind over Mind

Legend: [Word or Phrase] could be {Alternative Word or Phrase, Alternative Word or Phrase, ...}

[Theory and Practice of] could be {Art of, Skillset for, Tools for, Key to, Path of}

[Instinct] could be {Motivation, Gut Feeling,}