Of what others have suggested and that I’ve read: the ones most similar to what you’ve finished are:

• The First Law series by Joe Abercrombie
• The Expanse series by James SA Corey
• Hyperion (at least the first two books, w/ optional two more) by Dan Simmons

New recommendations:

• Dhalgren by Samuel R Delany (content warning)
• The Baroque Cycle series by Neal Stephenson (Snow Crash and the Diamond Age may both be better starting points for the author, but may fit your other criteria less)
• The Book of the New Sun series by Gene Wolfe

Other works that stretch your genre boundary but may evoke the right emotion:

• Collected Fictions by Jorge Luis Borges
• If on a Winter’s Night a Traveler by Italo Calvino
• The Name of the Rose by Umberto Eco
• Cloud Atlas by David Mitchell
• The Satanic Verses by Salman Rushdie
• Lovecraft Country by Matt Ruff
• Plain Bad Heroines by Emily M Danforth
• John Dies at the End by David Wong

I haven’t seen Project Hail Mary by Andy Weir here. It’s Sci-Fi, it might not be very sanderlanchey but it’s one of my favorites. I read it in a weekend, and it usually takes me 1-2 weeks to read a single book. I gripped me from start to finish, and had a great conclusion. I recommend you give it a try!

Some of my favorites! Mostly Sci-fi, but there a bit of fantasy too! The starred items are my absolute favorites; listened to on repeat. Not the most obscure list, but I don’t care.

The Expanse series is my favorite, but I want to highlight Dungeon Crawler Carl and Redshirts. Sci-fi tends to be serious and depressing, but these books are funny. I genuinely laugh out loud at Dungeon Crawler Carl.

• Leviathan Wakes by James SA Corey*
• Red Rising by Pierce Brown*
• Old Man’s War by John Scalzi
• Redshirts by John Scalzi
• Hyperion by Dan Simmons
• Ancillary Justice by Ann Leckie*
• The Midnight Library by Matt Haig*
• Wool by Hugh Howey
• Heretical Fishing by Haylock Jobson
• Dungeon Crawler Carl by Matt Dinnimon, narrated by Jeff Hays (listen to the audio book. It’s good in its own, but the narrator goes above and beyond anything else I’ve ever heard)*

A couple of my favorites from recent years, as someone who has also read all of the Cosmere books.

The Broken Earth trilogy, starting with The Fifth Season

The Between Earth and Sky trilogy

Two very different recommendations.

First is the Southern Reach novels by Jeff VanderMeer (the first one being Annihilation). Unsettling, surreal Lovecraftian sci-fi. Gorgeously written, beautiful prose, and very memorable.

Second is the Mars Trilogy by Kim Stanley Robinson (starting with Red Mars). Hard sci-fi on an almost unprecedented scale: a comprehensive and incredibly detailed narrative of the colonisation of Mars, which covers almost every possible aspect of the story in glorious, engaging detail. You get everything from the love triangles and personal rivalries of the colonists, to politics and religion, to macro-economics, to superstructure engineering, to long deep chapters covering hydrology, micro-biology, the finer points of lichens and mosses, to architecture, art… Honestly, it’s breathtaking in just how thoroughly it covers its subject whilst still being a poignant, engaging, story. Not to everyone’s tastes, but it could certainly make an impact.

It sounds like you’re looking for a mind blowing sander-lanche.

I’d highly recommend going through Ted Chiang’s book “exhalation”. A more popular example of his work is the movie “arrival”, which was based on one of Ted Chiang’s short stories.

It’s a collection of short stories, but don’t be misled - these stories have stuck with me for years, and as someone who has also read all of the cosmere, it is these short stories that have the biggest twists, and also the largest impact. A few of my favorites are below:

I’ve always wondered to myself, "how many of my youngest memories are my own, and how many are in reality, stories told around photos that I’ve seen? The story “The truth of fact, the truth of feeling” makes you think about the role of technology in our memories through one example in the past, and one proposed in our future.

“What’s expected of us”, free on Nature, is a haunting story going over the role of free will that can be read during a bathroom break.

Finally, “anxiety is the dizziness of freedom” had one of the biggest gut punches I’ve ever read. One best gone in blind, I think.

I’m usually a SF guy but the most memorable read these past ~2 years was the fantasy books The First Law by Joe Abercrombie. The first book hooked me in and I ended up devouring all 9 books. The audiobook version read by Steven Pacey was superb, that man really breathed life into the characters and I’m glad I listened rather than read them.

I recall wanting to read more dark fantasy after and tried listening to Stormlight Archives on recommendation from a friend but the readers and writing was so bad in comparison I gave up after 2 hours.

What about a mix of scifi and fantasy? The Starship’s Mage series by Glynn Stewart is pretty cool.

Here are a few I really enjoyed recently

• Edges by Linda Nagata
• The Mercy of Gods by James S.A. Corey
• Wool by Hugh Howey
• Ordinary Monsters J.M. Miro
• The Mountain in the Sea by Ray Nayler

A bit of a different suggestion, but I highly recommend Unsheathed (Sword of Coming), a chinese fantasy novel of the xianxia genre (same as Journey to the West). It’s simply incredible and beautifully written. You can read the first 50 chapters for free at Wuxia World (website/app). You can also find some epub compilations of the first few volumes around the internet if you know where to look for.

Ware Tetralogy by Rudy Rucker

John Shirley is good, I’ll recommend him because nobody knows him instead of like Heinlein or Herbert who everyone knows. Shirley writes some stuff for IPs (everyone needs money) but his OG stuff is good like the eclipse trilogy.

1. Realm of the Elderlings saga by Robin Hobb (completed I think)
2. World of the Five Gods series by Lois McMaster Bujold (ongoing)
3. Wall of Night series by Helen Lowe (ongoing, link goes to first book in the series)
4. Innsmouth Legacy series by Ruthanna Emrys (ongoing, link goes to the first book in the series)
5. Piranesi by Susannah Clarke (standalone, not a series)

Yumi and the Nightmare Painter

I liked that one. Some recommendations:

• Dune. At least 4 first books. I assume you read it already but if some reason not, read it asap, by far my favourite series.
• If you’re not averse to Warhammer 40000 universe, Gaunt’s Ghosts series. it’s 16 books though.
• Lois McMaster Bujold, Barrayar series. You will either love or hate Miles.
• Glen Cook. Everything by Glen Cook
• Jack Campbell, Lost Fleet series, the spaciest and operiest space opera possible
• Arkady Martine “A memory called empire”
• Lloyd Biggle Jr “Monument” - pretty forgotten but great sci-fi classic

The Wayfarers series by Becky Chambers is some of the best sci-fi ever written, in my opinion. Deals with high stakes stuff but has such a gorgeous focus on characters and cultures. I could just live in some of the moments in those books.