Big trading volumes attract investors too. When people see the big volumes they think that crypto will be prospective and start to buy it.
If we remember the end of 2017 year, when cryptocurrency was so high, we will understand that when people who have no trade experience enter the market, they don't look at volumes at all, just at the price and its history
True indeed in 2017 the price of cryptocurrency really rose dramatically maybe it was a very good moment, of course, and all of us like that could happen again this year or the following year