One of the things many songwriters ignore is the idea that some of the excitement that comes from a chorus gaining some notes that a verse didn’t have. If you feel your chorus is lacking an explosion there is two easy steps you can take to make it bigger. Make sure the main melody get a new note that is not used in the verse that is higher than any other note sang until then. On the bass instrument save a not that is lower than any other note hit in the song for the chorus. If you couple these two techniques together you will enjoy the feeling of a “big chorus”.