During the first dump, the volume was low because the selling pressure was also low at that level, hence, the price pushed up by the bull to 40k level.
However, looking at volume for last few weeks in the second red circle, the volume is significantly higher but the price is still moving side way, there are big players dumping their coins to the market slowly without causing panic.
I myself is a long term bull for Bitcoin and I have also experienced the 2017 crash, people are still very hopeful that price will go back up to 46-50k level, but I believe thing will get worse before getting better.