This is what Bitcoin investment is about i.e. long term. If someone is looking for short term gain then he must look into Bitcoin. See the history of Bitcoin and we can see that there is good increase in price every 4 to 5 years. Long term investment doesn't only mean to avoid selling while price is down, it also include not selling even if you are getting few bucks over your investment. For instance, there are people who are getting excited on this bull run. They must HODL and should not sell in this small bull run. If they do so they will miss out the bigger piece of the cake.
Bitcoin investment is not an investment that you rush into selling when their is a small bull in the market. The investment requires patience and emotional mind control for a long term. If your mind is not prepared, you will always get a negative energy and another instinct to sell of your investment so that you don’t be at loss. Bitcoin investment has shown a promising return on investment for years now, it is only the ones that understand how the market works that take advantage of the golden opportunity that bitcoin holds.