Are you writing a book or telling a story?
Do you want to write a book, or do you want to tell a story?
Each one of these has a different motivating force.
Each one is not better or worse than the other.
Know what motivates you.
What motivates you? Having a message or creating a book?
Or, you could be motivated by the experience you want the reader to have when they read your story?
I like the meatiness of a book. I like reading a story that takes me hours upon hours to read.
As a reader, I like losing myself in my characters’ world and lives. As a writer, I like the same things.
What is the experience that you like to have as a reader, as a writer? They may be the same.