I think you know already the answer, if you sell at this price now then that 80% loss will be a huge disadvantage of you but if you hold then look back on your investment after a few year then there's a chance you can earn it back which deepend on your holding if they will move upward on the following year. If youre a good trader then, you can do trading and scalping until you earn back the loss but I suggest yo forget now your portfolio.