Certainly there will be times when bitcoin will go up again in value. Maybe it will be several years from now. And there is no point of panicking. Hold as long as you want and as long as you don't need the money yet. But if you really need your money then never wait for it drop too low and be back up maybe 5 years from now. It's a long wait if you really need your money, even a year is very long for someone who wants it for immediate need. So if you really need your money never store it in bitcoin otherwise you can do so even if it takes a hundred years and let your heirs claim it for you.