When seeing your investment of 500$, I just think about ICO investment. But this type of investment is very risky and it is consider as a gambling. But if you have a big liver, you should do base on carefully understanding about project to get huge profits. Good luck!
After getting the token from an ICO projects, when it published, you has ability to resell it with a cheaper price. Then, don'y be panic with a lower price of tokens. They can buy it with lower price without priority rights of founders.
The market becomes more complex when people are very difficult to predict and guess. Then, I think you better to sell it when it brings huge of profits currently. Sell a coin and invest in another coin is a optimal solution.