How can Doraemon-based games stay fun and engaging for long-term players?

I’ve noticed that Doraemon-themed games attract players because of their gadgets, storytelling, and colorful animation. But over time, some players lose interest once they’ve explored most features. What are the best ways Doraemon-based games can keep players engaged for the long term—through new missions, creative gameplay mechanics, or story-driven updates? I’d love to hear thoughts from fans who regularly play Doraemon-style games.