The Dunning-Kruger Effect

The Dunning-Kruger Effect is often portrayed as "stupid people are overconfident in their beliefs"
But really, the DKE is a correlation (not causation) relationship and it applies to smart people, too

There's also an issue of sticking to a fixed mindset
We don't have much control over our genes contributing to the intelligence we possess, but we do have some control over the amount of confidence we have in our understandings

What would happen if we started acting "smarter" by having less confidence in our beliefs?