James SA Corey (which is actually a pseudonym for two individuals) got their start with the expanse series, so there isn't much beyond that yet. There are a few novellas in the expanse universe so check those out for sure, and then they released the first book in a new series in 2024 called "The Mercy of Gods". It is quite good! Very different, but quite good. It reminds me quite a bit of some of Adrian Tchaikovsky's stuff so if you like his work you'll definitely enjoy it.