No, he can't come back. He was not totally destroyed with the Ring, but he was so weakened that he became nothing more than a "shadow of malice" forever unable to ever again take shape.
He was permanently rejected by the Valar. That was the whole towering thunder-cloud being blown away by a cold west wind scene in ROTK.
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...finding a path that cannot be found, walking a road that cannot be seen, climbing a ladder that was never placed, or reading a paragraph that has no...
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