No. As far as I know, introspection is a good way to convince yourself that you have become more rational, and not a good way to learn things or become more rational.

Someone recently tweeted about "effort shock" - discovering the amount of effort to accomplish something worthwhile, analogous to sticker shock.

Going to school and getting a degree and going into research and writing some bad papers in order to keep your job long enough to write some good papers might be the kind of effort necessary to improve the state of the art in human rationality - though I'd love to hear about faster ways.