War and Peace is stunning. I liked it even more than Anna Karenina.
Thomas Mann’s Buddenbrooks is also excellent, but depressing. Also Theodor Fontane’s Effie Briest, which is not quite as depressing.
Middlemarch is another favorite. Mill on the Floss would be good, too (and I haven’t read Daniel Deronda yet, but I think it would fit the bill also).
The Victorians generally are good at big books that follow multiple intertwined characters across time and complicated, dramatic relationships - Dickens, Hardy, Elizabeth Gaskell, Trollope, Thackeray.
And finally, if you can deal with Faulkner (he’s not everyone’s cup of tea), his books aren’t long but Absalom Absalom sure does pack in a lot of drama and emotion.
Some good recs here.
I’d add the Ibis trilogy by Amitav Ghosh, and Glass Palace by the same author
Poisonwood bible
Loot by Tania James
All the light we cannot see
Pillars of the Earth; Agony and the Ecstasy—these two are right in line with your list.
Jack Whyte’s “A Dream of Eagles” series, the first of which is Skystone, is like a more mature/literary Game of Thrones. It blends Roman military history with antecedents of Arthurian legend. Good stuff. For the more explicitly Arthurian/magic stuff, try the Mists of Avalon.
Others in the grand vein include To Serve Them All My Days (or anything by RF Delderfield) and Trinity (Leon Uris).