Cryptocurrencies Cap was $500B before New Year and now it is $700B+, where are you seeing end? Where is the difficult time?
For me currently it is boom period for cryptocurrencies. It is not Bitcoin which going down but other coins coming up. From 2010 up till now, December 2017 - Jan 2018 were/are the best months for ICOs. The amount invested in ICOs and cryptocurrencies was highest till now. Moreover, have a look on charts of cryptocurrencies. You will find that 6 of 10 have sudden increase in these two months like one given below:


On the other hand, as far as Bitcoin is concerned, second half of 2018 gonna be boom for it. Expert Analysts have already estimated that it will see some correction in first half, no need to worry.