It's not right time to sell bitcoins, only if you scared that price will drop when halving comes, but i don't really believe that could happen. Better to hold right now.
Most people panic when price of bitcoin crashed,it is more likely of losing hope that bitcoin would not recover,this causes price to dumps if holders have weak hands over their bitcoins.Panic selling has nothing to contribute with someones investments just because he/she wanted to cut their losses.We invested because we want profit but if we have lack of courage to hold our coins then most probably try some other alternatives to earn money from other sources.Hand off in investing and try in mining inorder not to contribute the bitcoins weakness due to panic selling.