How to improve worlds (with or without CC)?

I really like the aesthetic of the occult worlds, but I wish there were more lots! As far as I am aware, there is no way to add new lots, and there is no Create A World option (yet). The lots I want to build would look out of place in, say, Willow Creek or Newcrest, but I can only create so many lots in the occult worlds, and maybe I want to create a lot bigger than 40x30. So... I'm asking, is there any way to customize existing worlds or whatnot so that I can create a gigantic vampire mansion in an environment that actually makes sense? Are there any CC worlds you can download? I know I can increase lot sizes through Sims 4 Studio, but last time I tried that, it turned out to be a disaster. Anyway, if you have any good ideas, let me know.