If you think you know the answer to this question, there's a good chance you're aiming too low.
The great achievements in humanity have not been accomplished by people who were satisfied with where they were in life.
They weren't done with the attitude that "good enough" is what they're aiming for.
They were done with a passionate willingness to reach higher, take it further, risk more and stretch the boundaries. The cliche "think outside the box" refers to this mindset, and instead of treating it as a corporate mantra thrown around loosely by management, think of it this way...
All of the limitations you have set for yourself are based on the past.
Your brain knows what your comfort zone is, and it will do what it has to do to keep you in familiar territory. Well that's somewhere you've already been...
Do the thing that scares you.
The mind, once stretched into a new dimension...grows, what are you doing to stretch yourself?
Now go jump start your day.