If you loved Made in Abyss: Wandering Twilight, try Made in Abyss: Dawn of the Deep Soul
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

Made in Abyss: Wandering Twilight
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Made in Abyss: Dawn of the Deep Soul
What they share
Both films are directed by Masayuki Kojima, and they both carry the body horror, dread, foreign gem mood tags, and they sit in Adventure / Animation / Fantasy / Mystery territory. If that's the register that drew you to Made in Abyss: Wandering Twilight, the second film will land in a comparable space — through a different lens.
body horrordreadforeign gem
What Made in Abyss: Dawn of the Deep Soul is
Rain on the whistling elevator cage. Riko, Reg, and Nanachi reach the putrid fifth layer. A fabled delver offers sanctuary. The Abyss asks a toll. Modern anime overflows with sentiment; here, dread lingers.