Time travel is not the only way for Tony to appear, when we consider the more traditional ways. While there will be plenty of Iron Man scenes in the MCU that can be used as flashbacks, it’s much more interesting to create more new scenes that offer never-before-seen scenes from the character’s life.
Throughout his life, Tony has influenced many different people in the MCU, and his sacrifice is sure to have an impact on many other characters as well. Also, just as ‘Black Widow’ is a movie that takes place between ‘Captain America: Civil War’ and ‘Infinity War’, the MCU could bring back a project to a time in the past to bring the character back. .