If you loved Legend of the Galactic Heroes: Overture to a New War, try Space Battleship Yamato
A bridge between a film you've already seen and one most people haven't. Space Battleship Yamato has roughly 3.1× fewer votes than Legend of the Galactic Heroes: Overture to a New War — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

Legend of the Galactic Heroes: Overture to a New War

Space Battleship Yamato
What they share
Theyboth carry the epic, foreign gem mood tags, and they sit in Animation / Science Fiction territory. If that's the register that drew you to Legend of the Galactic Heroes: Overture to a New War, the second film will land in a comparable space — through a different lens.
What Space Battleship Yamato is
Some Japanese tech gets an unlikely upgrade. When aliens trash Earth’s atmosphere, a battleship becomes a spaceship on a toxic clean-up run. The resulting voyage is less Battlestar and more seasick snack.