Following the unprecedented financial success of the first film, several sequels to Avatar were greenlit to expand the world of the Na’vi. As of this writing, many of those films are still in development, but the release schedule is undeniably mind-boggling.
After all, the second film in the intended Avatar series is only now coming out, 13 years after the first movie. How many Avatar films could there possibly be after a gap like that?
Source: https://www.distractify.com/p/how-many-avatar-movies-will-there-be