Is it possible for the Avengers or someone who’s incredibly powerful to go back in time and grab alternative timeline Infinity Stones to restore the present Infinity Stones that have been reduced to atoms back?
In theory, yes. The Infinity Stones technically can shape anything that happens in the universe and, since each stone controls a fundamental energy, they can shape it and make infinity stones again. But to be fair, we have no clue if that really is possible.
