Yep Sir good day!
The "whole world isn't going to be saved" not exactly but there may be few as compared to the majority who live in this world but the whole world sins are paid for by Christ. Exactly this is what Paul wrote to Timothy and also to Titus exhorting them.
1 Timothy 2:4 Who will have all men to be saved, and to come unto the knowledge of the truth.
1 Timothy 2:6 Who gave himself a ransom for all, to be testified in due time.
Titus 2:11 For the grace of God that bringeth salvation hath appeared to all men,
1 tIMOTHY 4:10 For therefore we both labour and suffer reproach, because we trust in the living God, who is the Saviour of all men, specially of those that believe.
One of the factor why many have not come to Christ to be saved is because they have rejected the knowledge of the truth of the gospel. Another thing is the lack of labour to spread the atoning death of Christ by the believers.
In John 2:2, God's wrath/ judgment to mankind is now appease through Christ sacrifice. Through Christ propitiation, there is restoration or reconciliation.
Romans 5:10 For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
Thank you and God bless,