https://www.cnet.com/news/avengers-endgame-100-days-to-april-26-here-are-some-theories/

Iron Man and the remaining Avengers will concoct an elaborate plan to steal back the Time Stone and beat Thanos at his own game. But how will the mere humans among them ever plan such a clever scheme without Peter Quill/Star Lord's help?!?! (Since his 50 percent alien DNA makes him that much better at scheming, he said.)

All of the dead Avengers will remain dead (the franchises will continue with replacement heroes), and Iron Man will die in a last ditch attempt to defeat Thanos. -- Ty Pendlebury