Leaving in ruins refers to reducing something to a state of complete destruction or shambles. Antonyms for this phrase are words that signify rebuilding, repairing, and restoring. Some suitable antonyms for "leaving in ruins" include constructing, building, creating, repairing, restoring, renovating, improving, and enhancing. These words signify the act of building something new or renovating something old, rather than destroying it. They indicate the opposite of leaving something in ruins and instead suggest the process of rebuilding and shaping up something for the better. Using these antonyms in place of "leaving in ruins" would help to highlight more positive or proactive actions.