The same wasn’t explicitly stated for Luke Cage, but it would be hard to believe the hero is going to fade into obscurity, especially given that the cancellation (reportedly) wasn’t all about ratings.
It’s been said Netflix was unsatisfied with initial scripts that the Luke Cage writers provided for Season 3, which led to tensions that ultimately resulted in its cancellation.
That’s certainly a possibility, as Netflix had confirmed Danny Rand may still appear in the Marvel universe despite Iron Fist’s cancellation.