If you loved One Piece: Defeat the Pirate Ganzack!, try One Piece Film Red
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
Both films are directed by Goro Taniguchi, and they both carry the playful mood tag, and they sit in Action / Adventure / Animation / Fantasy territory. If that's the register that drew you to One Piece: Defeat the Pirate Ganzack!, the second film will land in a comparable space — through a different lens.
playful
What One Piece Film Red is
Eiichiro Oda's vast ocean, a concert at sea, Uta's voice soaring. Luffy and crew face a mysterious pop star with a world peace plan. This anime film lands well after the louder episodes.

