I think the third part of the saga is about memories and reminiscence. We hear more voice echoes and occasional dissonant piano chords. Around the 3:00 mark, we hear the memoriiiiies. Grey did not elect to fill in the piano chords, this is not just any other pop song.
Compared to the older version (below), 2023's is definitely darker. It is no longer about anger, anguish, and helplessness. Death (as in void/emptiness) perhaps?