@NicoleCRust Have you already read Seveneves by Neal Stephenson? If not, I’d recommend. If you like it, his other books are also great, but his writing is quite uneven: the books have parts that are hard to get through and parts during which it’s impossible to set a book aside - so Seveneves is better on that regard as it is more even. Or Diamond Age maybe.
Or, totally different flavor, have you tried China Miéville? If you like series, start with Perdido Street Station.