Do you keep holding it hoping that the price will finally come up since it seems you can't actually trade it with it current value.
Well ideally if there are signs of the market downward, you should be able to get out and sell before you get stuck where you can not do anything with it anymore because the price is too low
But let us say that you were not able to get out fast enough then there really is no other option but to hold and hope that the price rises again
If it rises again, congratulations but if not life goes on