I think it is, definitely. If you believe in crypto and think it will grow in the longterm, then why not to buy now? Even if it takes months to restore the market and if the dump even continues... You can't guess the ideal point to enter, nobody knows the future 
The ideal point is when a decline has occurred even though after being bought another decline will also occur, which is clearly always an ideal thing to be used by everyone who wants to buy coins in larger quantities according to their abilities.