Fastest way to F1 TO H4 with valid H4 stamp


I have valid H4 stamp until October 2020. I did my COS with in the usa H4 to F1.
I would like to come back to H4.
I have completed my masters.
What is the best and quick way to move back to H4?

Best Regards

The fastest way to get on to H4 is to go out of USA and re-enter using your H4 visa stamp.