God does not prevent a non-elect person from surrendering to Jesus in repentance and faith.

Exo 4:21 And the LORD said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go.

Rom 9:8 That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
Rom 9:9 For this is the word of promise, At this time will I come, and Sara shall have a son.
Rom 9:10 And not only this; but when Rebecca also had conceived by one, even by our father Isaac;
Rom 9:11 (For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth;)

Jesus blood is potentially available to cover that non-elect person’s sins.

I'm gonna have to ask that you show the universalness of Christs atonement from scripture.

God knows, however, that the non-elect person would never surrender to Jesus under any circumstances, actual or non-actual. Thus, God only provided enough blood to cover the sins of the elect.

Then, since the blood only covers the elect, there is no potential, but actual atonement.

As far as I can tell, you aren't a calvinist, but possibly a modified wesleyan.

God bless,