I think it is very risky to just hold one altcoin in your portfolio, it seems you have to divide your investment in some kind of altcoin to make it more secure. But if you have studied the graph of altcoin that you hold it up, I think it's back to you
Keeping the whole money in a coin is very risky in this market because there are so many fluctuations that can negatively affect the coin you invest. Have a plan to divide your investment more appropriately, you can invest in BTC, ETH, XRP, ICO and commercial day, these are the coins and how I am using the investment.