Feeling great that you researched well in such a short time and chose the best investment in crypto at this moment. I am glad that you did no go through EOS and BNB. I had a big hope on BNB, but after so much drama, I started hating Binance exchange and its coin. Overconfidence kills the thing, they should know. And EOS rank is very high but this coin is not profitable. But you may go for Litecoin, it's like a brother of Bitcoin. If Bitcoin price grows,  Litecoin will grow too, so, as you have 500$, then you will get more LTC than BTC, right?