By Analogy Land At Will And Safely

 If you have been levitating at 7.489 Hz, maybe,

$7.489*\cfrac{528}{432}=9.153 Hz$

or

$7.489*\cfrac{432}{528}= 6.127 Hz$

either 9.153 Hz or 6.127 Hz, like the portal opening or closing will bring you down safely.

Good night.