in my opinion, this is one of the best investments that can happen in 2018. after a sharp drop in the exchange rate, prices are low enough to buy. therefore, I did not invest and did not worry.
I don't understand, you didn't invest and you're not worried about it but you're saying that since the market is down now is a good time to buy? Those are two opposite things.
If the market is down, as it was until today, you buy ETH as much as you can and just wait for prices go up again. And they will go up again for sure.