Put these two complicated topics of consciousness and the hero's journey together, and you have a complex, fascinating, and extraordinary big idea.
The big idea is that human beings throughout history have had one universal story, the story of the hero's journey. In this universal story, someone — always a man in the stories cited by Campbell — undergoes self-transformation by becoming the archetypal hero. The book is both dense and academic as Campbell cites stories from around the world.
Despite its density, this book has been the foundation for explicit use of the hero's journey structure in movies. The first and most explicit use Campbell's hero's journey structure was George Lucas's Star Wars about the transformative hero's journey of Luke Skywalker.
Since then, Campbell's The Hero with a Thousand Faces has been the template for a wide array of movies.
Why does any of this matter for you? It means that any of us can be called to our own hero's journey adventures. Hero's journey stories describe how ordinary people undergo their own hero's stories as they change their own perceptions of their self-identity.