a few days ago ethereum experienced a drastic decline. and it turns out it's currently under $ 200! My personal predictions are wrong, and may not be true. what's the next step?

I think vacationing is a good idea while enjoying a vacation !!
I think this will continue for some time and we can find the price is quite low. But we need not to be worried about. The price of the coin will goes up a little time later. It will be the right coin in the marekt. And we cann find the high price we can get a lot of profit.