I Tim. 2:6 He gave his life to purchase freedom for everyone. This is the message that God gave to the world at the proper time..
Jesus did not die for just a select few. He died for everyone who would believe in Him for the forgiveness of their sins. Salvation has no limitations or favorites. Anyone anywhere and at any time can be saved. We must never assume anything about anyone's soul. The power of Christ to save the worst sinner on earth is more than sufficient to save him.
We should pray for those who aren't saved. Pray that their hearts will be made tender, that they will have ears to hear the voice of God. Pray that the Lord will send messengers to them with the message. Pray with faith believing in their salvation at the proper time for their souls. Pray without ceasing, knowing that the Lord is faithful and will do all He can to bring them to salvation. Pray knowing that the Lord is not willing that anyone would leave this life without salvation. Pray that we will have the same compassion of our Lord for lost souls, whether we know them personally or not.
How many lost souls are on your heart's prayer list? If you don't have a list, ask the Lord to lay some soul on your heart. No one will be saved without the work of the Spirit on their heart and it is prayer that moves the Spirit to act.