I think Bisq could be more attractive if he could have a payment method with Cash. It is very difficult to get something like this, there are some (incomplete) ideas here.
https://forum.bisq.io/t/request-cash-by-mail-in-usd-and-cad-markets/1866/20?u=erizo
Achieving a truly functional system could attract many users
Another idea to increase the volume would be to create an additional version of Bisq for use of exchanges without a FIAT gateway:
https://forum.bisq.io/t/so-few-users-on-bisq/2494/6?u=erizo
They are a little crazy ideas, but we have to leave the small circle. More ideas?