Timetravel should have been left out of the movie. It should have continued from where they meet up with Thanos after he destroyed the stones. The Avengers could have gone to the Quantum Realm, reconstituted the stones, brought everyone back and have a new threat to stop, something that Thanos tried to prevent by erasing half of the universes life. Would have been a perfect way to introduce Annihilus. Thanos could have done what he did after discovering the NegativeZone and the threat of so much life in our universe was causing on the NZ and Annihilus attacking to destroy and conquer that threat
TheShadowKing's comments