They need to build slowly again. Retire a few current characters and have the new ones build momentum against less universal scope villains. Have a new team movie after the new characters are established against say the heralds of Galactus then bring back the old members that aren't dead for Galactus himself.
__________________ Sweating on the streets of Woking
He should be played by an actor who will be taken seriously though. Even though Reed is mostly a pacifist, he's one of the most dangerous people in the Marvel U.
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Besieged by countless foes, his eyes they are aglow, longing for the fight. He stands upon a mound, doesn't aim the throw, just lets the hammer fly!