With such a strong decline in prices, it makes no sense to sell your coins because you will incur losses. I am sure that soon the prices will rise again, and then you will get your profit from investing in cryptocurrency. Just don't do anything rash.
But we can make a good starting point if we take a chance when the drop begins again in the future. right now, peoples are speculationg about the price in range or around sub $4000.
Bitcoin already tested it twice before, and more likely it will test it again in the next few days.
if the price declines to that level, does not that mean we are getting 10% from where we were selling it before ? of course, the price might not be going down.