I graphed the relationship between closing price against volume on SPY using Python

I plotted the graph with SPY closing price(left y-axis, blue) and volume(right y-axis, green) from 2019 to March 2022.

When volume(green) cross up between 1.5 ~ 2.0, it will be a good spot to start looking at change in trend/price bottoming. Higher the volume, bigger the dip.