Excuse me!!! Here try again:
"At that time they shall call Jerusalem the throne of the LORD; and all the nations shall be gathered unto it, to the name of the LORD, to Jerusalem: neither shall they walk any more after the imagination of their evil heart. In those days the house of Judah shall walk with the house of Israel, and they shall come together out of the land of the north to the land that I have given for an inheritance unto your fathers." [Jeremiah 3:15-18]
Let me help you here. Jerusalem was and is known as the City of David. Thus the entire City of Jerusalem, the entire City of David, will be called the throne of the Lord. Jerusalem will be the throne of David.
Actually, Jerusalem and the city of David are not identical in the Bible. Mount Zion is the city of David (cf. 2 Sam. 5:7). Jerusalem was originally inhabited by the Jebusites (Jos. 15:8), and encompassed a much larger area around and including Mount Zion (cf. 2 Kings 14:20). Jerusalem is never called the city of David.
Of course the undeniable fact is that in the NT we see the ultimate expansion of Mount Zion/Jerusalem to include all the nations of the earth. The conquest of Jebusite Jerusalem by the nation of Israel is typical of the spiritual reality we see happening today.
The NT interprets the Old, not vice versa. (I noticed you really have little to say about the NT to make your position.)
The earthly is typical of the heavenly reality. Jerusalem above is free. You just have not gotten there yet. But it’s only a matter of time.