Eth sentiment graph
Eth graph
Quoting to show your graphs, which are crucial to illustrating the point you're trying to make (and the question(s) I have).
So, both graphs are of the same time-frame and line up during this particular slice of time?
That's definitely interesting at first glance, but a good test would be running it back in time as far as you can to see if the pattern remains consistent.
I'd be interested to see how closely they correlate at varying levels of analysis and if there's any anomalies that might pop up when looking at a bigger data-sample.
If so, then what you're suggesting might turn into a solid piece of the equation for when to get in and get out.