Break a habit. Do something that makes you feel insecure. This advice, from Piero Farruci, is good advice for anyone wanting to be more creative.
Habits are one of the great enemies of creativity.
Even the most creative of us is prone to be trapped by our habits. Refuse to do it the old way. Force yourself to find a new way. Then tomorrow find another new way, until you find the best way. Whether you are designing a marketing campaign, looking for a new career, or painting a picture, simply refuse to do it the way you have done it in the past.