I would not be disappointed in God’s plan, whether that means life elsewhere or not. Even if God made life elsewhere, I doubt humans from Earth will ever find it in the vast universe, certainly not in my life time. Though the search for it is noble.
“Though the search for it is noble.” Why?
Millions of humans throughout history and today claim they have been contacted by aliens.
You are free not to believe them, of course:
https://podbay.fm/p/aliens-and-artists
C.S. Lewis did some sci-fi books. He said something similar iirc - if it was part of God’s plan there may be life elsewhere. Or maybe he was “positive” there was life elsewhere, I don’t know.
He also said something like “I wonder if those other people sinned, or are still in their Garden of Eden. Although if they never sinned, they never would have experienced the wonderful gift of God’s grace - so I would feel sorry for them.”