If you loved Guardians of the Galaxy Vol. 3, try The Guardians of the Galaxy Holiday Special
A bridge between a film you've already seen and one most people haven't. The Guardians of the Galaxy Holiday Special has roughly 3.5× fewer votes than Guardians of the Galaxy Vol. 3 — 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.

Guardians of the Galaxy Vol. 3

The Guardians of the Galaxy Holiday Special
What they share
Both films are directed by James Gunn, and they sit in Adventure / Science Fiction territory. If that's the register that drew you to Guardians of the Galaxy Vol. 3, the second film will land in a comparable space — through a different lens.
What The Guardians of the Galaxy Holiday Special is
Christmas Eve, a faint sound of sleigh bells, a spaceship lands. The Guardians converge on a gaudy mall, Mantis and Drax in mismatched outfits, searching for a perfect gift. This special is a sugary treat best watched during the holiday season.