Think about what it really is that makes you happy. Think about the basic components of that career experience and decide which are the aspects that pull you.[1] Realize what attracts you to that career. Do you find happiness in making other people happy? Are you more attracted to the art of acting and the process of creating the work of art that is a film?
You can do this for your current job as well, not just a theoretical dream job. If there's something about your job that you do now, factor that in as well.