If you loved Doraemon: Nobita and the Legend of the Sun King, try Doraemon: Nobita's Dorabian Nights
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Doraemon: Nobita and the Legend of the Sun King

Doraemon: Nobita's Dorabian Nights
What they share
Both films are directed by Tsutomu Shibayama, and they both carry the cozy, playful mood tags, and they sit in Adventure / Animation / Family / Fantasy / Science Fiction territory. If that's the register that drew you to Doraemon: Nobita and the Legend of the Sun King, the second film will land in a comparable space — through a different lens.
What Doraemon: Nobita's Dorabian Nights is
Here's a film for the kid who's bored with Scheherazade. A magic book transports Shizuka to the world of Arabian Nights, prompting Doraemon and friends to rescue her. It's a testament to the Doraemon multiverse that this barely cracks the top ten.