What comes after 1000 Hertz?
Any frequency greater than 1000 cycles per second “comes after” 1000 Hertz. It could be 1001 Hz, or 1048 Hz, or 20,000 Hz, or 1000.00001 Hz. Or 1,000,050,002 Hz. You get the picture. And frequency greater than 1000 Hz will come after it, whether it is a tiny fraction of a cycle per second, or many multiples of the original frequency.