Why is Robert downey Jr not going to be ironman anymore?

Robert Downey Jr. has indicated that he is stepping away from the role of Iron Man after his character's significant arc concluded in "Avengers: Endgame." The film served as a culmination of his journey in the Marvel Cinematic Universe, offering a satisfying conclusion to Tony Stark's story. Additionally, Downey is focusing on new projects and exploring different roles in his acting career.