Just answered another on a similar question, but basically, diversify a small pot with several projects, learn the ropes of dealing with each, then add from your main pot to what feels most comfortable to deal with. And yes, OG Bitcoin is always a good bet
Note that I come from a local tech startup kind of investment angle, so things may work different in crypto, it just seems like good basics to me, and always has.
Edit: Just saw you write 500. I read it as 50K. My bad, sorry. At that rate, I'd go with straight BTC, like others have mentioned!