...They were the chosen ones until they rejected Jesus

Daniel 9 24-27 shows us that Israel had 70x7 years to...

Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy.

Jesus started His ministry at the beginning of the 70th week of years. 3 1/2 years into that ministry he was "cut off" He confirmed the covenant during that 1 week of years. In the middle of that week of years He ended the sacrifice and oblation by becoming the Lamb of God.

The Jews created an abomination by continuing to sacrifice animals. Because of that abomination the city and the sanctuary were destroyed.

After Jesus died and rose the gospel continued to go to only the Jews. That continued for 3 1/2 years fulfilling the 70x7 years. At the completion of that Peter saw a vision of a sheet full of unclean animals. From that he learned that the gospel was for all people.

That was the completion of God's plan for Israel to bring salivation to the world.

https://www.biblegateway.com/passage/?search=Daniel%209&version=KJV

Galatians 3:28 states There is neither Jew nor Gentile...

https://biblehub.com/galatians/3-28.htm