A sci-fi/fantasy blend is less complicated than it seems, if it is something you want to give a try in future. Mine basically started out very Star Wars-esque, before it took on a life of its own and I played up the magical elements more. I find that I don’t enjoy world-building for its own sake, so I tend to incorporate it into a story as I write. The results end up pretty fluid, but disorganised, which is interesting.