Looking at the chart, we see the last wave prior to the low at 5800 usd. It gave two Fibo extensions, 7500 and 8500. Both were reached within a month. In this case the last wave before the start of the drop (which is almost identical in terms of price change to the previous one) gives two targets, 6450 and 5175 roughly speaking. Well, we have reached the first one, from here a sideways move is expected for the next days and a more than probable second move would take BTC to the 2.618 extension located at 5100-5200 area.
Please note that many Fibos converge at this level, when this happens those levels are very likely to be tested.
We may be facing the end of this market, just keep in mind these levels and trade safely!