Bollinger Bands don't work on crypto currency, this is because crypto is so volatile it makes exponential growth a more obvious factor. Bollinger bands assume price will form a normal distribution around the mean which is WRONG, as prices increase in an exponential way, and the price will never fall below $0.
This is a bollinger band based around a log-normal distribution. Which is how prices actually behave.
Use this one instead. It's free.