If you need long-term investment, then I suggest you buy a bitcoin directly. You will know how rich you are when you come back five years later. For short-term investments, you can play some gambling games but the risks are relatively high. Choose your own.
Yes, Bitcoin investment is a very cool decision but you have to choose altcoins as well. Just think it over, which of the cryptocurrencies are good for you. I recommend you to buy Cardano, Gladius, Qtum, TRON, and KICK.