Actually it's not about loss, because it still depends on the price at which someone bought Bitcoin so that he can still make a profit if he wants to sell it now. Let's take the example of someone who bought more Bitcoin in January this year, of course he is still in a profitable condition when he wants to sell it now. However, because there is much better potential for such Bitcoin holders, of course selling for now will not be good enough if he can still wait for a much better Bitcoin price in the following month.
Well said, yh such investor will be in profit nevertheless it is advisable to have a long term approach in Bitcoin Market in space of 4-10 years so as to have enough stash of Bitcoin and also a solid Bitcoin portfolio, because selling now might result to later regret in future when you see higher prices as well nothing is certain in the future.
Its about investing in Bitcoin as a valuable asset, building a solid Bitcoin portfolio as an investor.
In essence, it all gears down to how much you have invested so far to determine your return before thinking of selling, also Your investment Plan and Target, How valuable you consider Bitcoin to be or you see it as a Tradable coin where you buy and sell anytime because you think you're already have made profit.
So execute, invest clearly without sentiments and emotions.