Marvel movies are notorious for their post-credit scenes. It usually sets you up for the next film.
Well, after you sit for two hours and 41 minutes of Black Panther: Wakanda Forever you can leave. There is no post-credit scene. There was a rumor that a Marvel villain would make an appearance in a post-credit scene but that rumor is being shot down by one of the producers.
Nate Moore, one of the film's producers said, the subject matter of the film was such that it didn't feel appropriate to have a stinger. Much like Avengers Endgame felt like an emotional experience that you also didn't need a stinger at the end of this. Unfortunately, there isn't an end-credit scene.