I'll share how I decided and use the novel I'm working as an example. I've place it within the sci-fi genre because of the core ingredients that make up the story soup. it takes place in a fictional world, set in the future. There's a magic like force but it's not enough in weight to theme the story fantasy.
what element is most prominent and where does it fit? Is what I asked myself after starting. Reading the chapters I had so far, I agreed with my first choice and feel it solidly fits into sci-fi.
