ETH and all the altcoins are severely depressed now. It is really a tough spot for such a decision. On one hand, they are very cheap compared to Bitcoin and they are worth buying, but I wouldn't expect any major surge in the short term until the end of the year.
That would be base on the decision making of a person. If he or she would buy ETH and afetr gaining it should be matter if selling it or holding. Though their is always a process the undertake the decision of a person.