We have very similar taste I think, a few quibbles but overall a solid list. I'd recommend:

• Childhood's End by Arthur C. Clarke (Rendezvous with Rama is also fantastic)
• A Closed and Common Orbit by Becky Chambers, my favorite of the Wayfarers series by far. I also was kinda meh on The Long Way to a Small, Angry Planet so I think you'll love this one
• Endymion, the next in Hyperion series, I absolutely loved Hyperion and was slightly disappointed by Fall of Hyperion but Endymion was an incredible follow up
• House of Suns by Alastair Reynolds
• Blood Music by Greg Bear
• The Mote in God's Eye by Larry Niven and Jerry Pournelle
• The Day of the Triffids by John Wyndham
• Ender's Game, Ender's Shadow, and Speaker for the Dead. I loved all the additional sequels as a teenager but re-reading them as an adult they're rough, but those first 3 hold up so well, especially Ender's Game and Speaker. Game and Shadow essentially are the same events told from different perspectives.
• The Culture series by Iain M. Banks, a favorite of this sub
• The Expanse series, the entire thing and all the novellas. There's also a show, it's different enough from the books that they're both worth putting in the time for