Ofc holding is able to work for you, especially if you have diversified your coin portfolio and are not disheartened by losses over the next few years. At this point, both the gold rush and the grand fall are over, so it does not really matter that much anymore, volatility is sinking, so holding is a very legit plan now, since even bad news don't seem to be able to crash the value again. As long as one does not assume to see the BTC or altcoins reach 2017 levels anytime soon, you are going to be fine.