Of course the best time to buy altcoin is when the its price is low. However, before investing make a research first and learn trading strategies. Also, dont invest all your capital in one altcoin. Divide your capital in different altcoins in order to divied the risks.
Even though the price isn't just dip but still profitable enough knowing that it grows and fluctuate every time.
Yes, we should take this huge opportunity to buy coins in bulk and make profits once it bounce back from long dip.