how to fix a mistake in translation?

Help I made a mistake, I was writing my own arrangement on things we lost in de fire by bastille, and I had a paper where the music, I wanted to use, was written, just not with the right intruments. So I had to translate it from A major to G major, so I set G major as the key, but then I moved all the notes from the paper one tone down instead of up. So now my whole music has a melody two tones too low.

Is there a way to keep the key G major, but move all the notes from the melody two tones up?