Albert Barnes Commentary Jeremiah 51:9

"We would have healed Babylon, but she is not healed: forsake her, and let us go every one into his own country; for her judgment reacheth unto heaven, and is lifted up even to the skies." — Jeremiah 51:9 (ASV)

Omit would. All was done that it was possible to do to heal her.

To the skies - Or, to the clouds.