Should we hold on to altcoins which we have invested and see the price dropping every moment or it will be better to sell them and buy it again when the value pumps ? I have already lost a good margin of profit with the ripple I don't want to make the same mistake with the Lumens which I Hold so should I hold on or sell out ?
it depends on the coins being held. You only decide whether to hold or sell looking at the potentials of the coins and if its a solid project that you can see a future in. Then you can hold till profit is made otherwise if its just another coin then you can sell off because some coins are pump and dump, they won't pump again even if the market conditions improve.