Golden Age, based on your description, seems to fit the description of a lot of my favourite books. I have a hard time picking favourites, so here are a few series, plus a few singles, I absolutely loved:
- Bobiverse, Dennis E. Taylor
- Expeditionary Force, Craig Alanson
- Red Rising, Pierce Brown
- Foundation, Isaac Asimov
- The Expanse, James S. A. Corey
- Children of Time, Adrian Tchaikovsky
- Project Hail Mary & The Martian, Andy Weir
I deleted my Reddit account today right after that insane AMA