It is not a good idea to sell cryptocurrency during the fall of the market.
After the fall of the market will be a rise. More and more people use cryptocurrency with every year and demand in cryptocurrency will increase over the time.
It is necessary to sell cryptocurrency when market rise and buy it during the fall of the market.
But many people do vice verse. They sell cryptocurrency assets when market falls and buy them when market rise. That is why many people lose their money on investments.