Books

Someone way to far down in the comments mentioned Arthur C Clark and the Rama series already.

I’ll go with Philip Jose Farmer and the Riverworld series then. Excellent 70´s to 2000´s philosophical sci-fi!

I'm currently three books into the Sun Eater series by Christopher Ruocchio. The first book is a Dune rip off until about the halfway point when it gets really good. The second book is awesome. I'm about 100 pages into the 3rd book. Most reviews I've read mention the 3rd book as the best in the series. There's still four more books after though. The latest one is set to release this year IIRC. The best I've heard the plot be described is imagine Anakin was justified about turning to the dark side.

I believe the most popular PKD is Man in the High Castle, my favorite is Ubik. But to be honest, if you disliked Do Androids, PKD may just not be your thing.

Hmmm… maybe next go for something a little less ponderous, try some Neal Stephenson, maybe Diamond Age.

Absolutely incredible, I’m disappointed knowing I’ll be done with it soon.

Hyperion was def one of those series that I was sad to finish, like, it impacted me that "how tf can there be no more of it" way more than the norm.

Simmons in general has a very wide variety of topics in genres & Hyperion alternates them nicely (while never really leaving sci-fi).

any suggestions

Maybe as a short palette cleanser 'The Terror' by the same author? It's completely different, but nicely done. I've read a few more books by Simmons after Hyperion & this one stood out* a bit more (it's not as polished as Hyperions, but much more than the rest I've read - overall easy to read, I like it when the setting/spaces are always explained, and most importantly it's one of those stories that I gladly let live in my mind).
Warning: it has one instance of horse riding! But it's in horny a flashback :). It's a historical fantasy with good semifictional characters, really tasteful blend of actual Inuit stories, historical nautical facts, & authors own derived reality of both, also one of the top tier "monsters" ever ... and the Hyperion-style technical description that make sense of the basically literal alien world (the same story could have been set in planet exploration).
[*Edit: I completely forgot about Ilium & Olympos. Those are sort of more of the sci-fi with the expected classical twist, but I stand by my Terror recommendation too, it just lacks interplanetary travel.]

The real suggestion (and I can't/am unable to explain why the association in my mind) is the Rama series by Arthur C. Clarke. It's prob one of the top easiest writer/books for me to read (the way things are explained & which things are explained, how characters act, etc). It's nicely logical & absurdity fantastical without it ever being fantastical for the sake of being fantastical (ie the big amazing things always make sense & don't seem forced or unlikely).

Dang are you me? Galapagos is one of my favorite Vonneguts. I recently finished Hyperion cantos too, and am now on book three of the Xeelee sequence which so far have been very good and give similar vibes as Hyperion.

Someone else mentioned Blindsight which is maybe a top three for me. Different tonally than the Hyperion Cantos but still excellent. Same goes for Children of Time.

A lot of good recommendations already but here are some I didn't see.

The Madness Season. Follows a vampire secretly living among humans after a alien race with a hive mind conqueres Earth.

Eight Worlds series by John Varley. Aliens with reality warping powers show up and kick humanity off Earth and Jupiter. Humanity has now colonized all the other planets. People and society have evolved in strange ways.

The Final Architecture. giant aliens sometimes show up and reshape planets with life into giant sculptures.

Against The Day

Inherent Vice

When Women Were Dragons

Circe

Annihilation

Check out the Miles Vorkosigan saga. Tons of novels. Good stuff.

In the same sort of vain like Hyperion are the Revelation Space series by Alastair Reynolds. He does the same sort of excellent work of world building and I found both series very comparable and intriguing. Also would recommend the Berserker series by Fred Saberhagen, very much a similar feel.

The Aubrey-Maturin series, not sci-fi but just about the best novels there are.

Maybe Foundation series, original 3.

Thanks y'all, I'm saving this post for all the good recommendations in there :)

Dogs of war

To sleep in a sea of stars

Expeditionary Force

Three body problem

The Pliocene Exile series by Julian May, starting with The Many-Coloured Land. I've read that series at least 50 times, and it's always a great comfort to read again.

The dude on the cover looks like Longfinger Kirk from Dark Souls 3 with the Thorn set armor.