If you loved Justice League Dark: Apokolips War, try Scooby-Doo! The Sword and the Scoob
A bridge between a film you've already seen and one most people haven't. Scooby-Doo! The Sword and the Scoob has roughly 8.0× fewer votes than Justice League Dark: Apokolips War — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Justice League Dark: Apokolips War
→
Try this next

Scooby-Doo! The Sword and the Scoob
What they share
Both films are directed by Christina Sotta, and they sit in Adventure / Animation / Fantasy territory. If that's the register that drew you to Justice League Dark: Apokolips War, the second film will land in a comparable space — through a different lens.
What Scooby-Doo! The Sword and the Scoob is
Medieval castle walls at dusk with clanging swords. The gang is transported back in time. A classic cartoon adventure unfolds with a Hanna-Barbera twist.