A novel's whole pattern is rarely apparent at the outset of writing, or even at the end; that is when the writer finds out what a novel is about, and the job becomes one of understanding and deepening or sharpening what is already written. That is finding the theme.
“People do more important jobs than acting in film that should be recognised, but for some reason it's big money, so people are elevated in status. If I was a bus driver, I'm sure you wouldn't be interviewing me.”