Everything is a risk, start from that. Question is how big risk is to hold, how big risk is to invest in trading with cryptocurrencies or with stocks, you can store gold if you have a lot of money, profit is not high but at least its the safest way for your money to not lose value over time.
Holding something you believe in more than just pursing profit, its a bit different. I think who ever hold carefully selected coins will have nice future, I also support trading with some amounts, but if you trade you need to have something on a side as back up, don`t trade without that.