$500 for a start is sufficient to give you 0.0073 Bitcoin which is a good sum of Bitcoin fraction that can generate up to $300+ profit when the price spikes to $110k+.
If you are consistent on accumulating with more funds, depending on income flow, you might be able to have acquired more Bitcoin before the price will fully get to a peak point.
Ethereum, BNB, Doecoin, Matic are also the few altcoins I can recommend.