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 !!
The worst thing is the ETH/BTC rate, which is 0.03. We have been that low at the end of 2017. Hopefully, we can recover at least to April level in the coming weeks to 0.05. I guess, ETH will start recovering, once Ethereum team will start releasing the updates. What do you think, what can effect the price to raise, any coming news?