I think the article is missing two big ones. [1] Observing those around you that are very successful and entrepreneurial. I could name 5 people right now, I've seen all of their YouTube videos (probably more than once), read all their interviews. [2] Surrounding yourself with highly driven people. The same applies if you surround yourself with apathetic and lazy people. It probably sounds cliche by now, but that energy is contagious and will affect how you work, think, behave, etc.