I personally hold not only all the BTC and ETH but my favorite coins such as Waves, Monero, MGO, NXT, etc. too
Completely no reason to sell during this market because it will result in a greater loss for you surely. Yes, we can't know the future BUT it's at least possible for coins to recover in price. If you will quit now and sell there will be no possibility to potentially grow for your holding anymore!

And yes, HODL is only for the brave