Reviewing Hugos last 20 years or so:

Ann Leckie is great, Tamsyn Muir is gothic horror lesbian necromancer-ish and super cool, Andy Weir is a full humanist in the best sense, Arkady Martine is a thoughtful writer I enjoy, Yoon Ha Lee was a fresh voice at time of pub, and worth reading, Cixin Liu fits your request, I love me some Stephenson novels, in your request category I recommend Anathem, Kim Stanley Robinson can be tiring, but is also pretty great, everything China Mieville has written is worth reading, full stop, Paolo Bacigalupi's adult fiction is fucking great, although I sort of bounced off his YA stuff, Vernor Vinge will read like near-history reportage, but was way ahead of its time when published, if you haven't read Iain M. Banks (also goes by Iain Banks for non-genre), you have 10-20 novels that are just fantastic waiting for you, Dan Simmons Hyperion is excellent, Bruce Sterling is worth reading.. Let me know if you get through this list.