Iam using for my TA the startpoint of 12.01.2015, when the uptrend started and the top of my first big wave ended on 18.12.2017.
If you take this into consideration, as well as the fact, that the last big retracement bevore of 12.01.2015 was 38% below of the Fib 0.78 on 12th of Jan 2015.
My theory is that, if we are taking this into account as well as possible panic sells, we could face a correction down to the 4.300 - 2.700 USD, which has also major in the past.
I guess we will see a massive sell off, once we would reach the Fib 0.786 in a few days and then the sharks will bite and ride the wave upwards.
Thats the theory of a noob only ;)