Just the opposite of what a wise investor should do: when it goes up very fast, sell at least partially and buy when the everybody is panicking. Or even better: buy and hold.
LOL, this is always SUCH a nonsense. I mean sure in hindsight it's easy to see when you should have bought and should have sold. But bitcoin prices have ALWAYS gone up very fast, did you sell when it hit $2000 for the first time? $5000? And when are the prices "very low"? Most idiots here will say that the $6500 it's at now is very low. I say it's still very high and that we'll see <$2000 this year. And if that happens, which I think it will, then this $6500 in hindsight wasn't exactly 'very low'. So these oneliners you post are really nonsense.