IMHO,
Learn how to be enterprising if you plan to go big.
i.e.:Attend a University ID program and take as many business classes as possible. There isn’t an ID program on the planet that prepares you for entrepreneurship. We’ve all been trained to run the rat race and fear “The Man”.
If you want to make it big some day, you’ve got to know how to take calculated risks, negotiate, cut a deal and protect yourself! Chances are your design profs have no idea about that stuff or they wouldn’t be teaching design.