With me $ 500 isn't a sum too expansive, nor too little. With $ 500 it will be hard for you to make a benefit as of now. With $ 500 you can purchase a ton of altcoin outside the best 50, anyway you ought to pick the potential altcoin and expectation it will develop later on. Or on the other hand with $ 500 you ought to spend additional cash to purchase an ETH, this would be a long haul venture, and it will bring you benefits later on