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THRILLHO
I don't know if I am hardcore sci fi or what...I couldn't get into the Dune series and the Star Wars books don't appeal to me...but I like John Scalzi, The Murderbot Diaries, We are Legion (We are Bob).I used to be heavy into fantasy novels and read just about anything set in the AD&D Forgotten Realms. R.A. Salvatore and the Drizzt Do'Urden books were my favorites. Also liked the books by Raymond Feist about Pug the Magician.
Last 10 years or so started really liking Sci-fi.
David Webber's Honor Harrington and Safehold books.
Man-Kzin Wars books were great.
There is plenty out there.