cixin liu - 3 body problem trilogy is by far the best i've read, and i've read quite a bit

neal stephenson - anathem and cryptonomicon (i didn't really think that much of snow crash but others do)

arthur c clarke - rendezvous with rama is fantastic, and short rather than the sprawling epics that some of these others are

adrian tchaikovsky - children of time and dogs

those books are all amazing and special, I hope you try them