Well for me, when I read first the question, there is only thing that comes into my mind that answers this question, in which how can we make crypto into viral, and that is, make and spread several fact news, announcements and updates about crypto currencies which positively influence the community. A good great and positive news will make more people to become more curious regarding the crypto and will eventually engage to it.
The word cryptocurrency is already viral and it is already in internet. However, if we want to make it more reliable we should use the news to spread it because most of people always believe in news so that using news to spread the word cryptocurrency can really attract more investors.