I haven't read the other responses so if this is duplicative, forgive me.

Anything by Guy Gavriel Kay. He has several stand alone books, a duology, and a trilogy, so you can pick what you prefer. He's just a terrific writer.

If you liked the Amber series, try Lord of Light, also by Zelazny, one of my all-time favorite books.

The whole Deryni collection by Katherine Kurtz is good.

The Darwath trilogy and subsequent books by Barbara Hambly.

Harry Turtledove's tetralogy starting with the Misplaced Legion - a roman legion magically transported to another world. Excellent series.

Fred Saberhagen's Book of Swords.

The Thomas Covenant series by Stephen Donaldson. The first trilogy is the best, the second good but not as good.

The Raymond Feist Midkemia books, starting with Magician: Apprentice are generally good, some more miss than hit, but the first two, the Magician books, are solid.

The Thieves' World series from back in the day had some great stuff. They were co-edited by Lynn Abbey and Robert Aspirin, with lots of great authors contributing.

"Dirk Gently's Holistic Detective Agency" by Douglass Adams. Everyone forgets that the writer of the Hitchhiker's guide wrote other stuff, some very funny and good indeed. This is my favorite of those.

And in that same vein, the various Garrett, P.I. series by Glen Cook, starting with Cold Copper Tears or Sweet Silver Blues, I forget.

Lastly, it's cyberpunk, which I don't usually love, but.... Richard Morgan's last three books about the character Takeshi Kovacs, first book being Altered Carbon. Very well done.

There are many more of course, but this should get you started, certainly with all the other posts as well. I only have the benefit of having been reading fantasy books for some time, about 30 years now. Enjoy!