BTC to USD is rather simple to understand.
There are simply no buyers and why would there be in this market? There is no reason to buy BTC other than to invest into other coins. But that simple isn't enough buying power to outway the sellers.
For me i want to see BTC to do one of two things before i start buying back into BTC and starting to trade other coins. As you can see on the chart we have a very simple buying and supply trend. And the trend of BTC it either dips into this trend and that creats the support or just touches above it. Also as you can see i've put some support and resisatance lines on the chart that if this trend line brakes they could be the next support area.
It's a very simple chart and i haven't gone into great details as i don't feel the need too.