Apparently, the sideways market broke down not out. Are we in a "now what" situation?
It is a time to buy if you have cash at hand. If you keep thinking why and how it happened, you will never be able to reach the trading decision.
Or do you think this is as far down as it goes?
It can be beyond this price too. It only means that someone is selling out there and lower than average prices are possible to be bought at.
Even the week chart looks bad for BTC. Any suggestions what to do?
Good and bad dont really exist in the professional traders vocabulary. It is either a choice to buy or sell. When the selling pressure is high the chart will be in red. For bitcoin if you have faith in its future considering it past charts, then you can make this decision on your own.