If you loved Kabaneri of the Iron Fortress: The Battle of Unato, try Attack on Titan: Chronicle
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.
You already loved

Kabaneri of the Iron Fortress: The Battle of Unato
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Attack on Titan: Chronicle
What they share
Both films are directed by Tetsuro Araki, and they sit in Action / Animation territory. If that's the register that drew you to Kabaneri of the Iron Fortress: The Battle of Unato, the second film will land in a comparable space — through a different lens.
What Attack on Titan: Chronicle is
You wake in a city whose walls shelter from Titans but divide you from the world. Then the colossal breaks through. The director pares the first three seasons into a two-hour sprint, taut walls become battlegrounds. The film leaves you standing where the story began, humbled by its pace.