you can sell all your assets, I don't care. That would spell out that you lose a lot. Or who knows maybe you bought it at extremely low price then you still gain, but you lose the chance to gain more.
On the other hand, if you hold it and buy more coins instead, you will probably gain more profits in the future should market recover - and it will.
Yes, there is an option to sell coins at the current price, and in case of the beginning of the market recovery, buy coins at a lower price. But this plan will work only under certain circumstances. You can easily lose money, so it's best to just wait for the beginning of growth.