With that being said, it’s not as though the rule is that the Marvel Cinematic Universe can only deal with one crisis at a time. There could be major issues with invading universes, but that doesn’t mean that Nick Fury doesn’t have his eye on a different major threat approaching Earth. He does, after all, have his own series on the way called Secret Invasion, so is all this space business tied to that? If so, that would explain all the Skrulls, given that the original Marvel Comics story featured Skrulls slowly taking over the identities of heroes.
Article source: https://www.cinemablend.com/news/2573560/nick-fury-been-up-to-avengers-endgame-marvels-secret-invasion-samuel-l-jackson