For me it is to search inside myself. Ask myself what subject interests me right now; what do I want to share with the world and the other is contemplating the reviews I'll get whether positive or conflicting. Either way they give you food for thought and a push ahead.
Challenges motivate me. Contests or seeing someone do something I know I can do better excelling, makes me want to do it for my own self awareness and improvement. I hold on to them by seeing the results I've accomplished. I am always striving for more, for better. I know I hold the key to my own destiny, therefore, I must do it in order to get what it is I want.
By being interested in something. I realize I can do it and find ways to motivate me. Printing pictures and creating a list of all my dreams or goals. After crossing a line through one of the names, I feel accomplished.