Well it’s all in the commentaries of Calvin and on Calvin. Bottom line, if the Bible says there are those that are predestined for Hell then no matter what they do i.e. believing in Yashua and believe in salvation then there’s no hope for them. You can’t un-predestin yourself.
Straw man argument. No one can believe on Jesus unless God enables them.
1 Cor 12:3 Therefore I want you to know that no one who is speaking by the Spirit of God says, "Jesus be cursed," and no one can say, "Jesus is Lord," except by the Holy Spirit.
Matthew 16:17 Jesus replied, "Blessed are you, Simon son of Jonah, for this was not revealed to you by flesh and blood, but by my Father in heaven.
John 6:37 All those the Father gives me will come to me, and whoever comes to me I will never drive away.