Does DCA buying Bitcoin make sense at a few hundred dollars per month?

I am in a position to commit to buying about $300-500 worth of Bitcoin every month - essentially classic dollar cost average (DCA) approach. But, with Bitcoin staying above $60k for past 3 months and likely to hold that level or go higher (currently it is at $70k), does this much of DCA even make a difference anymore to increase my BTC stash? I mean, I will end up adding less than 0.01 bitcoin every month - that seems rather insignificant.

Or should I give up and just put all my money into buying some plain old S&P500 index fund instead? At least, it gives a dividend and is considered safe, having a hundred plus year history and all.