If you loved Escaflowne: The Movie, try Tales from Earthsea
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.
What they share
Theyboth carry the bittersweet, outsider mood tags, and they sit in Adventure / Animation / Fantasy territory. If that's the register that drew you to Escaflowne: The Movie, the second film will land in a comparable space — through a different lens.
bittersweetoutsider
What Tales from Earthsea is
Barren landscapes, a fading sun, a lone dragon's shadow. A kingdom in disarray, people behaving strangely, dragons appearing where they shouldn't, and a young prince with a dark side. This is a film best watched with an eye on its fantastical world-building.

