Coming into the chorus (which would usually follow each verse but in this case arrives a bit later in the song), I play with added emphasis and incorporate some higher notes for effect. As you saw, during the last chorus I momentarily move my right hand up an octave (i.e. 8 keys farther to the right on the keyboard).
Moving up or down an octave during a particularly active or emotional part of a song is a great way to add variety to your playing. Doing this can enhance the emotional response that listeners have, too! In this case, temporarily using higher keys for same chords has a brightening effect. That's a great way to break up a melody which is fairly repetitive overall.
I increasingly incorporate some improv techniques near the end of the song as well, allowing the music to swell at during a final moment before bringing the piece back down to the basic chords. That final moment of relative quiet and simplicity is how I return to the contemplative tone of the first verse.