Devide $500 to 5 parts and invest 100$ in 5 different new alts just come out to IDEX from "high" rated ICOs on icodrops and trading near ICO price. That coins have big chances to be listed on big Exchanges and make x2-x3 in near future
I do not think that this option is suitable for long-term investments. New altcoins grow rapidly in price and fall as quickly as they do, and then they do not rise again. It is better to buy time-tested coins - the top 10 on CoinMarketCup.