For DODO, some project have a good volume trading. But, I think the problem is not in the exchange it self for volume. The token it self need to have a good volume, to holding with long term you need to make sure the token you are buying have high volume and can survive with a long time.
Otherwise, your holding token will be dead because the token you are buying have small volume or maybe dead volume trading.
Agree, I'm still using DODO exchange for the next few months. They have confirmed some gift offers on Twitter https://twitter.com/BreederDodo/status/1501422446171148291
DODO DEX exchange has a fairly decent trading volume, and for CoinEX and Bkex personally, I don't use it. Especially trading on Bkex is the same as waiting for a long queue that never ends.