The line in my chart is the up-trendline i draw in November which has been tested a few times but never broken since then. I am watching this line since then.
If the market can not recover and will start to close candles on the 4H chart under this line then Ethereum is realy in trouble and you should be ready to buy on the bottom after signs of life.
I estimate a drop that will go at least to the mid 600:
If you are more inclined to risk you can start to accumulate starting with 660$ gradually as it goes down. If you are more conservative wait for a reversal signal first and buy after confirmation.
I am not shorting this market so for me this is a long signal