Because is no more trade volume like was in 2017 and also cause many people not invest now on crypto after they see price of bitocin where is from 20k.
its not about the volume its the project it self why they are not interested to buy that coins. If there are no use cases of that coins /tokens it will surely be dead even the loyal community will leave sell thier coin/token if they see that they can make any more improvement to the project.