If you loved Arthur 3: The War of the Two Worlds, try Arthur and the Revenge of Maltazard
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

Arthur 3: The War of the Two Worlds
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Arthur and the Revenge of Maltazard
What they share
Both films are directed by Luc Besson, and they both carry the playful mood tag, and they sit in Adventure / Animation / Family / Fantasy territory. If that's the register that drew you to Arthur 3: The War of the Two Worlds, the second film will land in a comparable space — through a different lens.
playful
What Arthur and the Revenge of Maltazard is
Apparently someone's in trouble again. Arthur answers a distress call from Princess Selenia. This sequel is more of the same.