I created the green upward triangle and two red downward triangles by taking the historical upward/downward moves in % and in min/max/avg number of days lenght of the bull/bear moves. Then projected that into the future. As for the red triangles i choose two starting points, one was the BTCG fork and the other is the 2x fork.
I put a purple cirkle to illustrate when i first made the chart, i didn't publish it yet though as i was using another site at that time in stead of tradingview. Moved over the chart as i like this site more.