I'm going to jump right into this one. 20% is a significant drop. Imagine pools of people exiting the market and the late buyers panicing, trying to figure out what is going on. Yes, this can be scary but also good. The truth is, Ethereum and Bitcoin has to stabilise eventually.
This 20% drop can be a trigger for a bearish market. If it continues to go down, then you'll see consistent spikes where as people assume they have found a support price, when really they are just bots, pools and also late comers that recieved the news too late. The bots and pools of people are going to short the shit out of the market until the trend dies out. You'll know when the market is at base price when there is a large loop in the charts that literally goes up and slams back down to the same price.. twice.
Most ethereum supporters threshold are around or below $50 - 100. After the $100 threshold, you get medium loads of late comers that have bought in slightly late and also pool pumpers.
So, just wait until people start saying, Ethereum and Bitcoin are scams, give it a few months to a couple years, and the cycle will repeat. The next big cycle is going to create a trillion $$ bubble, that is gonna be within the next 5 years.