I been loss about 50% now, but iam not loss before i sell the coins, so i keep holding it. In my opinion the market now in accumulation phase and will take a few month, then try to rebound. The bearish trend like in 2018 can be happen again, but my prediction, not now for that because that too early.
You are not at loss if you are not selling, although when you open your portfolio, you might see a -50% loss. And you can't do anything, just continue to hold and see how it goes in the next 6 months. I know it's mentally tough to see bitcoin down like this, but this corrections need to happen.
Others will argue that this is healthy in the long run, as investors and speculators like us, average Joe, can still invest at a cheap price. I also agree that we are not in the bearish trend similar to 2018 yet, to early to call that.