Monthly S&P 500 Flirting with Significant Fibonacci Extension

FX:SPX500   S&P 500 index of US listed shares
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My last idea was that the stock market might burst up from a descending channel and move up decently. It did. Now I'm starting to grow wary: earlier than I hoped. I think what it's doing now - advancing bit by bit without a pullback - is convincing people who missed the bottom that it's safe to buy now. I don't think so it's so safe now. 2045 was safe.

My biggest concern is after quite a lot of years in a bull market - and one long sustained run since late 2011 - the S&P 500             is having trouble at the 2.618 Fibonacci extension level:
The ES1!             contract shows during the last eight months volume was much heavier on the sell months than the buy months:

I suspect the market is undergoing distribution. I don't know what could spur this market for much longer. I'm pessimistic now.
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