Bitcoin keep on falling down and no sign of raising. How long can we keep holding?
Till you can get profit, you will not loss your money if you don't sell your coin in lower price. A few years ago bitcoin price is only about $200 but in line of bitcoin adoption the price is now increase, just wait.
I think it would be wise if you sell it when the value increase. Ofcourse you also have to invest time for that but if you will earn bigger there is nothing wrong in being patient, everything needs time so be patient a earn big be wise in making decisions.