I genuinely miss portal fantasies. I don't want them to take over the shelves, but there was a lot to be said for throwing the hero into a completely different culture and world and watching them try to survive.
Also, stand-alones. I know they're still out there, but they seem increasingly rare. Whatever happened to just one compact, amazing story? Some of the best books I've ever read (and continue to re-read) have been stand-alones.
Portals are still out there, if not as common. Seanan McGuire does some great deconstruction of PF in her Wayward Children trilogy, though the first one (
Every Heart a Doorway) is more about the aftermath of children who had been on portal adventures and returned - often against their will - to the "real" world. (The second one,
Down Among the Sticks and Bones, follows the actual portal adventure of two of the characters, sort of a prequel, but can be read as a standalone.)
As for stand-alones, I am with you 100%. It's so tiring to find a great-looking story, then read the blurb and realize it's Book 5 of 250 - or Book 1, but it's technically a sequel trilogy to some other series, without which you'll be totally lost. And I don't think we're alone; many years ago, Tad Williams's
The War of the Flowers advertised on its cover that it was a complete story in one volume.