I’ve posted about the blue “triangle oscillator” previously.  Its highs correspond to  highs on the btc price chart.  For a long time I’ve also been trying to come up with an algo that identifies the transition from bear to bull.  Finally did it this morning, and it was dead simple:  the red trace equals -1 times the half cycle moving average of the triangle wave oscillator.  In this backtest, a vertical bar marks each transition signal, which comes at the oscillator minimum.  A local minimum marks the dip in the 2021 double top too.  Not that I think I could have traded that signal.  Clear in hindsight but it would have been confusing at the time.