Easy explanation.
Jehovah told David in 2 Samuel 7:12-14 that he would establish his kingdom and his descendants forever.
That lead down to Jesus or was supposed to. But Jesus didn't become king. So what happened?
In Dan 4 it was put on pause, for 7 times, 2520 years from 607 to 1914.
The kings were sitting on Jehovah's throne and he was sovereign. So when they stopped being sovereign, it was paused. That was in the 3rd year of Jehoiakim which was in 607 as Jerusalem was destroyed in 587.
Note anything that requires Jerusalem to be destroyed in 607 is wrong, because the prophesy was not about Jerusalem, it was about the kings in the line of David being sovereign.
It all makes sense when you understand it, which it does not sound like you do.