If you panic and sell your bitcoin, it will only make the market worse and the bitcoin price will go down. So when bitcoin prices are down don't panic and don't go sell your bitcoin. Although it does not have much impact on bitcoin, at least if you do not panic and do not sell Bitcoin, the price will not continue to drop. What do you think ?
a couple of things you need to know is that those who panic sell aren't going to just change their mind and not panic sell during a FUD season just because you told them to. they will continue their irrational behavior until they either go broke and leave the market or learn from their idiocy and make better decisions in the future.
also selling when price goes down is not a bad thing but only as long as you are doing it with a little bit of thought. meaning you should analyze where on the drop you are selling. if it is in the initial stage while price has not gone down and has not reached the bottom then it is a good thing, but if it is in the final stage like selling at the bottom that obviously is idiotic.