Aquaman and the Lost Kingdom is set to be the last movie set in the DC Extended Universe. The sequel to 2018's Aquaman, the project may also be the final appearance of Jason Momoa's take on the King of Atlantis. The jury is still out on its quality, but a rejected idea for the first movie may have made for a better sequel.
Source:https://www.cbr.com/jeff-nichols-aquaman-pitch-perfect-last-dceu-movie/