Rise of Endymion, fourth/final in the Hyperion Cantos series by Dan Simmons. This book stayed with me for a loooong time.
Any of the small remaining Discworld books by Terry Pratchett that I am slowing reading now. I get anxiety the closer to the final book.
Kings Rising, the third/final book in the Captive Prince series by CS Pacat. There is a short story called Summer Palace set after the events in KR, published separately as part of other Captive Prince shorts. It’s lovely and a balm. It would be great if it was part of KR, as an epilogue. Would have helped my heart; it was a while before I even learned of the short stories.
To Say Nothing of the Dog, by Connie Willis. This was such a delight.