There were many Jews accepting Christ on Pentecost. The apostles were Jews.
The apostles never went out to all the nations preaching the good news. They stayed in Jerusalem, argued a bunch and disappeared. While Paul was able to spread the good news to the gentiles and the gospel went out to the world.
The apostles did go to Samaria. Philip did preach the Gospel to the Ethiopian eunuch. Peter did enter the home of a Roman to preach the same gospel Paul preached. The results were the same.
No one is saying individual jews did not accept Jesus as the messiah.
And the apostles did not follow the Lords instructions go out to all nations. They waited at home for Jesus to return.
Actually, sometime after the great Church Council at Jerusalem, the Apostles did go unto the known world, even to the West coast of India, where they preached the Gospel of Grace and were martyred. Some died by spear point, some were flayed alive, some were beaten to death, some crucified for their preaching. But they did not ‘go’ until after the great council and the growing realization that they were making the same error their forefathers had made since Abraham, holding up with the Truth revealed to them.