Investments - always the risk. Depends on what you want to get and how soon. If you want to get quick growth invest to one coin that gave the maximum growth for the last day and wait for another weak. But you will have the same chances to loose and win. But if you want to get 80% success in growth but ready to wait, then invest to BitCoin, ETH, XRP, IOTA and other big coins. They will grow anyway in next year, most of them could give you x3x5x10, even for Bitcoin current price is not a limit, but capitalization of that coins is so big, that it is almost impossible to drop their price much in one time.