Its always best decision to hold your all altcoins if they have the abilities to increase the price in the future. Otherwise its better choice to cut loss.
If you get profit then sell is a profitable thing, but if you are still losing money then hold and be patient is a better thing, I am always sure that the market will recover soon so I continue to be patient.
OP does not mentioned of profit as it's easy to decide to sell if we are at profit.
Just like most of us, OP have a big number of coins in his portfolio but dropped significantly due to the long bear period, selling
at this time would only help to minimize the loses and this is suitable for those who really monitor the market properly as timing is the key here.