All the above answers really address the issue well. Additionally, find one area of expertise (whether it's writing, directing or a craft) and focus on it, learning as much as you can about it, not only the appropriate technical aspects, but how it's evolved through the history of filmmaking. This will make you a stronger storyteller. Also, your overall attitude is critical. Confidence is important, but never let your ego get in the way, always be a student of film, throughout your career. Best of luck!