If you loved The Land Before Time, try Titan A.E.
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 Don Bluth, and they both carry the uplifting mood tag, and they sit in Adventure / Animation / Family territory. If that's the register that drew you to The Land Before Time, the second film will land in a comparable space — through a different lens.
uplifting
What Titan A.E. is
A post-apocalyptic Earth, ruins of a spaceship, alarm blaring. A young man holds a map, an alien threat looms, humanity's fate hangs. This animated sci-fi adventure is best watched on a lazy Sunday morning.

