I discovered some major periods.
Mark this: 371 day and 553 days. Plusminus couple days or weeks. When was the first halving, we have got new significant peak after 371 day, and a second peak at 553 day. It happened again in 2016-2017 and 2020-2021.
The bearmarket started after halving 553 days, and it was 476 day long two times (2015,2018). There was an...