There really isn't a secret to winning the NCAA Tournament. Various people have certain phrases and tropes that they think are talismans to unlocking March Madness.
"Great guards dominate in March!" except for when they don't.
"Experience always prevails!" except when it doesn't.
"Defense travels better than shooting!" and so on and so forth.
Here's the one sure-fire way to win a danged NCAA Tournament, probably: just keep showing up for them. Because if you're there often enough, with a good enough seed (more on that later), eventually you'll get that lethal combination of skill and luck to have the confetti come raining down from the roof of a football stadium in your honor.