I'm brainstorming for my next book and I don't even know what genre to do. I'd like to write something that has a chance of selling and being found on Amazon. What is oversaturated and what isn't? I also have my own limits of what I can write. I'd like to write just a basic novel, but need ideas, or humorous fiction. But, I don't want to write romance, paranormal, and fantasy which seem to be most popular. Is there any niches left, or has it all been done?