An update on my previous chart, the Bollinger bands are updated on this one
This is a way to anticipate a Bitcoin's crash, the lower band goes vertical 1 or 2 weeks before the bear market. As you can see, price has just bounced on the lower band which is going up. We're still in a bull market.
This is a way to anticipating Bitcoin's crash from the bull run that happens every 4 years after each halving.
Hope you find it useful, stay safe and look for haven in advance.