VH:
Major premise#1: Three times this Babylon is called “O great city” (Rev 18:9, 16, 19) Minor premise #1: “The great city” is “where also their Lord was crucified” (Rev 11:8) Conclusion: Jerusalem is Revelation’s Babylon
Premise rejected. Jerusalem did not (and does not) have ‘a kingdom over other kings’), which definitely refers to 1st century Rome. Nor is it necessary that there can only be 1 ‘great city’.
As your first premise is rejected, it is not necessary to continue.