>>89236
I get what you mean; if you have enough range you can just play everything an octave lower. You could even transpose down by any other interval; with equal temperament it doesn't matter.
Option two would be to move just the part around the note that goes too high an octave down.
Third option: try to find out to which chord that note corresponds, and move the entire phrase down by one grade in chord, so for example if you got a G that goes up too high in C major you can lower it to E or C, and correspondingly move all notes. It will sound different but you preserve the essence.