What's the risk of being left behind? There are price points during the late 2013 rise that were never revisited (until well after the ATH that is.)
You could make risk being behind much smaller if you sell above some list of standard deviations.
The risk being rekt is much higher when you buy above deviations. At parabolic rise you should enter in corrections, not in trending. Better do not enter anyway in long during dramatic price rise - you should be already in long.
Price drops - buy. Price rises - sell. But you should know entrance points.