Self-Made Podcast

There is a story (I believe many of us have heard) where a professor walks in with a glass jar, three rocks, a bag of pebbles, and a bag of sand. You can listen to the podcast episode or you can read the story. But so much of our best "space" in our life is taken up by the things that make us mediocre. What are these mindsets that limit ourselves from being the best version of ourselves in both our business and our life?