You have five themes in your novel…how best to present them? Gradually, with a written record of when each story idea occurs.
I’m discovering that holding back on story questions and allowing them to unfold over the course of the story adds intrigue and guarantees fresh story material at those troublesome moments when writer’s block may occur. In the past, I tended to present the various story questions early in the novel, the result being that I usually ran out of ideas to explore once I’d reached the second half of the story.
I also think that adopting a zero tolerance approach to scenes/characters that don’t work will save a lot of time and prevent frustration. In the current rewrite of my novel, I’m working in a separate computer file to allow the story to tell itself.