The market right now is similar to 2013, which is really really high. IMO the market cap will go down. I would estimate it to be around ~$300 Billion market cap on average on 2018.
ok you have spot the similarity and compared height of 2017 with height of 2018, however, did you bother to compare number of wallets/active users from 2013 to 2017 ? do you think the same fundamental will apply with such a huge number difference?
not to forget number of exchanges, regulations, japan accepting bitcoin as legal currency, and a lot more....
I would suggest with your belief you should sell all your crypto assets and go full into fiat.