If you loved The Serpent and the Rainbow, try The People Under the Stairs
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 Wes Craven, and they both carry the dread, surreal mood tags, and they sit in Horror / Thriller territory. If that's the register that drew you to The Serpent and the Rainbow, the second film will land in a comparable space — through a different lens.
dreadsurreal
What The People Under the Stairs is
Los Angeles. Perpetual dusk. A crow's caw. Fool breaks into his family's soon-to-be-condemned house, hoping to find a stash of gold. Instead, he finds a pair of murderous shut-ins and their cannibal children. Craven's social anxieties get a colorful airing.

