Not only for Eth, but also bitcoin and many altcoins's the value are decrease. If we see in the coinarketcap today, the price of ethereum still goes down and reach $259 and it's happened too with bitcoin which is reach $5K. for many investor who want sell eth today can get many lost from that. But for invest, it is the best time to buy Eth because the price still lower. I believe Eth and another coins still alive and it just condition of market that the price of btc and altcoins never constant but fluctuative. Eth still valuable and we can get many profits from that.