i am always buying bitcoin, whenever i find a good opportunity in the market especially when i see a dip in price i jump at the chance and buy as much i can afford to invest.
but the majority of my bitcoins are bought when the price was low at $200, that was the time to load up on BTC.
for me if the bitcoin price down more than 5% in 1day it's a good day to buying bitcoin, although some news says bitcoin bad, although chart says time to sell.