Not really all about HODLING, myself got lucky a couple of times with the HODL strategy but I've seen some people being successful in the trading side. Its all about setting that stop-loss to avoid getting rekt so much. But some coins are worth HODLING, like BTC, ETH (with their upcoming ETH 2.0), and even XEM (with their 1:1 airdrop for their new XYM token).