I think if you have fiat available, and you can afford losing it in the event that BTC ultimately fails and goes to $0, then it's always a good idea to spread out that available fiat into small buy orders at random intervals. so like at every $10 drop you buy a trivial amount of bitcoins with your available fiat. As long as events like this keep happening, where people panic even though BTC is still fundamentally still working perfectly, you can just relax and forget about it.