We keep reading stories here that people regret not buying bitcoin when it was at 100$, 1000$ and 3000$ saying they thought it's too late to buy at that price. Right now bitcoin is at 30k$, few weeks ago it's at 16k$. So there is no way we can predict that when it will be too late to buy bitcoin.
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.
Talking too late would give rise to a lot of assumptions to justify and anyone would be far more regretful not to have bought bitcoins when the price wasn't much cheaper than a slice of pizza. The question is whether we will continue to mourn this regret, while at this time the opportunity is still wide open for us to buy bitcoin.
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.