If you loved Mobile Suit Gundam 00 Special Edition III: Return The World, try Mobile Suit Gundam 00 The Movie: -A Wakening of the Trailblazer-
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.

Mobile Suit Gundam 00 Special Edition III: Return The World

Mobile Suit Gundam 00 The Movie: -A Wakening of the Trailblazer-
What they share
Both films are directed by Seiji Mizushima, and they both carry the epic mood tag, and they sit in Action / Animation / Science Fiction / War territory. If that's the register that drew you to Mobile Suit Gundam 00 Special Edition III: Return The World, the second film will land in a comparable space — through a different lens.
What Mobile Suit Gundam 00 The Movie: -A Wakening of the Trailblazer- is
You pilot a Gundam, policing Earth's fragile peace. But a derelict probe drifts into orbit carrying an alien contagion. Mankind faces extinction. Mizushima's space opera climax is a kaleidoscope of utopian yearning and mecha mayhem. It leaves you contemplating humanity's place in a silent cosmos.