Did you know after it went up towards 20k that within a month or so it would hit 6K? I didn't.
No. But given the history, I was quite confident that, after it went up a lot in a short amount of time, it would nearly certainly drop significantly. It's not like we've not seen Bitcoin do that before.
Did I know $20K for the top? $6K for the bottom? No.
Which is why I have a trading strategy that does not rely on guessing correctly at minima and maxima.