If you have enough skill and great predictions on altcoins, then trading is the best for you. Sometimes you can earn 20x of your investment.
If you do take this route, I suggest what that altcoin serves.
Eg: 8ball games altcoin serves a purpose because people would want to bet each other for playing 8ball.
Something in that nature that follows some sort of demand, but also consider the pitfalls with altcoin as well.