I don’t mean use a capo on the guitar neck I mean you should hire someone high up in the Mafia to teach you how to do this.
Sorry.
Yeah, capo is the easiest way to do what you are saying if you’re working with open chords and don’t want to mess with barre chords. Essentially you achieve what @anon44377095 is saying up there by just placing the capo on the fret board to reposition the song.
The only issue you have is that it’s too high so if we’re only talking a semi tone or two you might end up with the capo up on the 10th fret, which is really quite high and will probably start showing issues with intonation.
What you could do is downtune your whole guitar one or two semitones, which would give your whole piece a different sort of sound but one you might really enjoy too.