I found something interesting on the BTC volume chart 24h and the whole market. When most of the BTC times hits the bottom, there is a very high volume of chart volume 24h. ( There is a high wave column ). Conversely, when the BTC peak, volume 24h (1D) is often very small (The volume columns are quite short).
This is a very good reference for you to determine the bottom
I do not say it is true, but it is quite interesting and logical.
Thanks for reading