With some people starting to talk about double tops and calling Bitcoin’s ATH in the rear view, do you think it’s time to sell if we don’t see the stock to flow $100K target hit in December?
Selling because the target hasn't been met wouldn't make much sense to me, it'd confirm the model to be wrong and for "this time to be different". This could mean another 50% shakeout, sideways trading or similar, before a continuation of the bull market rather than a multi-year bear market. Not reaching 6 figures (or price not having a blow off top) would be one of the few reasons not to take profits at the end of the cycle, similar to in summer there was no blow off top despite price going parabolic. The 50% drop became irrelevant, because it wasn't indicative of a cycle top, or just looked like 2013 all over again.
With other bubbles in 2013 & 2017 being in December, do you sell next month no matter what happens?
Not quite, the time-frames are slightly further extended than 4 years, ie 49 months rather than 48. So more like Jan/Feb is selling time imo, not December.
Previous highs were late November 2013, then late December 2018, so late January 2022 makes more sense to me at a minimum, or February.
Is it different this time? Will there be no bear market?
Not yet and therefore no. What goes up must come down, eventually. Unless something different happens this time around, like no parabolic move or blow off top.