This is easier said than done.
Indeed. It is easy to suggest people not panic about the dump, but I believe even OP will be worried to see a huge decrease in BTC price.
Most people are aware that the dump isn't the end of their assets, they know it probably increase again someday. However, there is no exact time for it, and no guarantee for the next pump. This makes most people are worried, I think it is normal. To avoid it or if you are difficult to avoid panic, it is better not to invest a long time, just buy and sell daily-weekly-monthly.
Most people will, but those who have deeper pocket, instead of selling they'll keep on adding.
It's tough to see that your investment value is falling but if you have trust and you really support this market, you'll wait and not to
add more pressure to the market, keep on buying if you still have good spare money is also an strategy by some big holders, they
knew that the market have that capabilities to bounce back.