In addition to the story of T’Challa, Black Panther: Wakanda Forever also killed off Angela Bassett's Queen Ramonda in a gorgeous and tragic way.

Source: https://www.cinemablend.com/superheroes/marvel-cinematic-universe/black-panthers-letitia-wright-explains-why-playing-shuri-was-so-difficult-in-wakanda-forever

This allows T’Challa to still have a significant role in the Wakandan royal and mystical structure during a time when his sister Shuri serves as Wakanda’s ruler.

Source: https://screenrant.com/black-panther-king-dead-title-secret-wars-zombies/

When Killmonger threatens to take over Wakanda itself, T’Challa will have to find it within himself to become the hero and the king that his people need.

Source: https://www.digitaltrends.com/movies/best-movies-on-disney-plus/