Seems like the bubble burst is already started today, from $18k now to $13k many of the whales are cashing out.
No, they are cashing out because its christmas time. This happened in the last years also. Just wait till around January and the price will rise again.
Dont you think it can be because of the segwit2x, which will be 28.12.? Christmas would be at the beginning of the week;)