You are your own motivation, the need is to realize. Motivation is what propels you to act. Self is the greatest source of motivation. It arises from your belief in value system.
Inspiration on the other hand is thought. The more you practise positive believing, the more motivated you will feel. The first and the most significant step is to identify your internal motivator because it lasts longer than external motivator.
These internal motivators could be sense of responsibility, pride in performance, ownership, or accountability. Find yours and strengthen your beliefs to succeed!