⁹ But you are not like that, for you are a chosen people. You are royal priests,^[a] a holy nation, God’s very own possession. As a result, you can show others the goodness of God, for he called you out of the darkness into his wonderful light.  ~1 Peter 2:9

Peter is saying to us: "Because of you are in Christ, you have become a new creation.   You have been set apart, a transformed person uniquely reserved for Christ and His Kingdom.   You are no longer of this world "set apart" for God by Christ to be a unique people, royal priest, a holy nation, God's own possession.   You and I when we become faith filled believers walking in Christ we become a chosen people like Israel, God puts His name on us.

I love Matthew Henery's commentary on this verse:

"All true Christians are a chosen generation; they all make one family, a sort and species of people distinct from the common world, of another spirit, principle, and practice, which they could never be if they were not chosen in Christ to be such, and sanctified by his Spirit."

Matthew Henry says we are a disticnt species of people different from those of this world "SET APART."

It's time that many of us operate as citizens of the Kingdom of God, be the people who God set apart through Christ.   Our world will change when the Kingdom is operating in its full power through the people in which Christ "SET APART."