If you haven't read Ted Chiang's short stories yet, do so. His first collection (Stories of Your Life and Others) was my favourite, but his more recent one (Exhalation) was also very good (the title story, Exhalation, is gorgeous). Stories of your Life is what the movie Arrival was based on and (as ever) the story was better than the movie.

As far as sci-fi novels, I have pretty generic tastes for this crowd: Dune, The Dispossessed, The Martian. The Crying of Lot 49 is one of my favourite books. Not exactly sci-fi but close.