Motivation comes from three things, provided you're in a creative role and money's not an issue: Autonomy, Mastery, and Purpose. You need to be able to decide how to get the job done, you need to be able to get better and better at your job, and you need to understand why your job matters in the scope of something larger than yourself. Figure out which is missing, decide if you can find it, and if not, go somewhere that can give it to you.