I still have a lot of Altcoins left in 2018 and I haven't decided to sell it. Because I also still suffered heavy losses. But this is at my risk when holding lots of coins. I will sell it when the market has gone up and now I'm sure the market will come back up again.
Much better to keep your coins inside your wallet while the bear season is not yet been over,
That is what he'l doing right now as you can see , the guy that you qouted above is already hodling his assets because he still suffers alot of losses . today we can see that the price is now getting better but its too early to say that the bear is over since most of the coins are still suffering , some are still at the red zone . best time to sell altcoins is when the time when we sell our bitcoins a.k.a bull trend .