The Hebrews and Israelites in the Bible aren't the Jews of today, the Jews of today are from the tribe of Judah, which wasn't the one that was blessed as the "Chosen People", the Hebrews/Israelites of the Bible that are blessed are from the tribe of Joseph, through Ephraim (Fruitful/Plentiful) and Manasseh (Forgetful), his sons, they are prophesied to be plentiful.
In Genesis 41:51, Joseph names his son Manasseh, saying, “God has made me forget all my trouble and all my father’s household.
The tribes of Ephraim and Manasseh were part of the northern kingdom of Israel, which was conquered by the Assyrians in 722 BC. The inhabitants were exiled, and many assimilated into surrounding populations.
The blessed people of the OT are all of us, all the nations on Earth, through the tribe of Joseph, all people on earth have been blessed through the tribe of Joseph.
Some of the Hebrews of Judah joined Christianity, the rest became Pharisees, none of the Pharisees in the OT or NT are blessed by God, they deny God and his son, they are not the chosen people, the tribe of Joseph are, which became plentiful (all of earth) and forgetful (assimilated in all of us).
The blessings started with Noah, the eldest sons were blessed, Shem and Japheth (through being in the tent of Shem) but Ham, the youngest, was cursed. (Later Ham and his tribe became the Canaans, but that's another story)
Later on, through Noah to Shem/Japheth to all their descendants to Jacob, Judah received a significant blessing from Jacob in Genesis 49:8-12, prophesying leadership and royalty. Joseph also received a major blessing in Genesis 49:22-26, with prosperity and prominence for his descendants, and he was favored by Jacob, but Judah and his tribe wasn't cursed, or else the ones that decided to join in Christ wouldn't be saved. But the ones that aren't saved are the ones that denies Christ, the Pharisees, or the Jews that we know of today, which none of them are the chosen people, despite what they claim.