If you loved Mobile Suit Gundam: The Origin IV – Eve of Destiny, try Mobile Suit Gundam: The Origin II - Artesia's Sorrow
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: The Origin IV – Eve of Destiny

Mobile Suit Gundam: The Origin II - Artesia's Sorrow
What they share
Both films are directed by Takashi Imanishi, Yoshikazu Yasuhiko, and they both carry the foreign gem mood tag, and they sit in Action / Animation / Science Fiction territory. If that's the register that drew you to Mobile Suit Gundam: The Origin IV – Eve of Destiny, the second film will land in a comparable space — through a different lens.
What Mobile Suit Gundam: The Origin II - Artesia's Sorrow is
You live in disguise on Earth. A Spanish patriarch provides safe harbor for you and your brother. But the sins of your past bleed into the present. The film acknowledges a mecha anime fanbase eager for backstory. It leaves you with a sense of dread.