Patience is the key indeed. HODL is tough man. People run out of patience to HODL and they sell off. You can buy the dip and sell the high only with patience. Long term investment requires a lot of calmness. It can only be done if you believe in your investments. Not only in ICO projects but for other business patience is required .With time people realize and learn the art of patience and reap benefits after the downtrends.