I am getting BETI at -2.083 currently using the formula described here:

https://bitcointalk.org/index.php?topic=470453.msg26854986#msg26854986

Since -2.25 is an all time low (in 2011) with second low in 2015 at -2.2, next point in progression might indeed be -2.15.
Perhaps, -2.15 would be IT for this cycle.

Next ATH might not even get to BETI=1.0 (achieved in 2017) and stop somewhere lower if peaks are actually on a declining trend (too small number of points so far).
Last peak was somewhat disappointing in that regard as I expected at least a match to 2013.