“Go ye into all the world and preach the gospel” “All”, everyone is the key.
Predestination has more to do with God’s Omnipotence, than the Elect being some written list...in that God knows the future, so in advance who will accept Jesus, therefore they have a destiny. They are predestined to accept him....they become the elect by free will choice, one of the universal laws spoken into existence during the Big Bang (God spoke the world into existence...how could there not have been a loud noise aka big bang).
But my understanding is Calvinists would disagree that one can become 'elect' by an act of their own will.
Perhaps I misunderstand.