In my opinion, there are several reasons why the price of ETH has decreased compared to 1 week ago:
+ The previous price increase was too fast and passed the real value of the Ethereum platform: the cause came from the successful launch of ETH2.0 & the rise of BTC price;
+ ETH2.0 has not yet shown its enormous value to the community;
+ Many people are willing to sell ETH for a profit;
However I think this is just a correction, as the ETH price remains above $1K and has a very strong upside potential in 2021.