Carrying my bag from airport to airport, no seriously. Why would I sell at loss?
Besides that I have good altcoins in my bag so I have no worries. I'm sure they will go up again in next bull run.
Depending on what kind of altcoins you are holding the strategy that you need to adopt will have to change, if you are holding good altcoins as you claim then you really do not have any reason to sell them now as if you are willing to hold for the long term not only you will recover your money but you will even make profits, however for someone holding bad altcoins then it is critical that they sell as soon as possible as even if they will lose money by selling now they will lose even more money if they keep holding.
Many people don't understand the importance of choosing good or potential altcoins for investment, mostly considering the price and looking for the cheapest one. And that is why they easily get disturbed and get panic when seeing price decline as these coins suffered the most dump.
Because if we are smart investors, we'd never choose projects that give us losses but, of course, those projects that will assure us some profit. But this is also impossible if we never learn how to hold and how to become patient.