Going the places that scare you.
I’m fond of primitive living skills and unarmed martial arts that train against armed opponents. There’s something about stripping away all technologies that you can’t build yourself in the moment that gives one faith in one’s capability far deeper than a high GPA, a good paying job, or any of the usual markers of success in today’s world. I highly doubt any cavemen experienced Imposter Syndrome. If you managed to be alive into adulthood, you had an intuitive understanding that you were some kind of awesome. Not so in the modern world.
Tiger Riding for Beginners 