There are lots of investment strategies that were proven correct over the period of time like some people buy at dip and sell when it's high while other prefer doing DCA. Whichever strategy you follow, make sure its long term not spread over period of time.
It's up to what strategy we use to buy and I'm sure if someone already knows the power of bitcoin they will try to maximize in any way possible to buy. DCA is believed to be the most appropriate pattern and can be done by people who have slightly smaller capital to buy, but the problem is that we also have to understand the strategy in trading and I prefer the long term for bitcoin, because it is not too dizzy to think about corrections or negative conditions in the market.