My #1 is Larry Niven, who's latest book is a wonderful Conan type fantasy "the Seascape Tattoo", all his hard sci-fi Known space series are well worth reading.
Try Ben Bova, his Mars novels and The Farside Observatory (on the dark side of the moon) was also a wonderful read.
Everything Heinlein, Herbert's Dune series, Brian Herbert's Hellhole series, the rock & rollicking Honor Harrington series by David Weber, most things Greg Bear, Arthur C. Clarke, Stephen Baxter, Sheckley, and Stephen Donaldson's Gap series is epic.
Hope that's useful 👍
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