Dont dump them, lisk is a very good coin and the chances to see it going down are just zero.
It will obviously go up, but it will take some time, it is obvious that lisk was just pumped by a pump&dump group, and there is nothing new with that.

But in the long term, it will go up again, and i know that lisk is one of the best altcoins that the market has, probably it will be over $20 by the next year (Q3 of 2018)
So dont sell them if you still believe on it, dont pay attention to those jealous people.