While "knowing" implies a certainty re the future which is unobtainable, the conditions today support a fear of the future. Bull mkts rally on fear and end when all are fearless and long. IMHO we have a small additional potential, to 3200 +/-100, but I dont "know" either.
Search for recent comments re Paul Tudor Jobes as an example of grounded fears.
A famous quote, author unknown, re bubbles is that they make every one a an idiot. You either experience huge opportunity cost, or real dollar loss during the break.
Good trades to you.
Oddlot