Wilkie Collins, both The Moonstone, and The Woman in White. (He invented the modern mystery with these 2 books!)
Anything by Dostoevsky, anything by Tolstoi; really anything by the 19th Century Russian novelists. They are so rich.
Tolkien–The Hobbit & The Lord of the Rings.
Oh! Dorothy Sayers’ Lord Peter Wimsey novels. The Nine Tailors is incredible…
For fantasy/science fiction, how about all the lovely Pern novels by Anne McCaffrey? She has created an entire world, with eerie resonances to ours…not without reason, but don’t read ahead! (Some are young adult fiction, they can be optional, but since you have time, why not those too?). I’m not crazy about her “hard” sci-fi; Pern is very special, though…
The Daughter of Time, by Josephine Tey… Perfect for reading in bed! The story of Tey’s oft-time hero of murder mysteries, when he is flat on his back in bed, & solves (?) one of history’s greatest mysteries from there…
I agree: Jane Austen is perfect. For something a bit lighter, but in the same vein, try Georgette Heyer’s delightful books. (Heyer, at the age of 17, ran out of Jane Austen books to read, & she sat down & started writing more of them. She had a wicked sense of humor, and she kept writing until her death about a half-century later, so there are lots to choose from. They are not mere fluff, they are really good reads!)
Oh, my…What else is too good to miss?? I know: The Scarlet Pimpernel, by Baroness Orczy.
Do you like historical fiction that stays close to facts? Jeff Shaara started out writing a sequel to his father, Michael’s, The Killer Angels [on the battle of Gettysburg], and has written wonderful stroies that show the faces that go with the names from American history. I especially loved Rise to Rebellion, & The Glorious Cause, his 2 stories of the American Revolution.
Oh, and a woman named Stephanie Barron has written a series of “Jane Austen mysteries”–delightful mysteries as solved by Jane herself!!