Not sure you are still paying attention to this thread, but...
When you have a marketplace, would it require a hair is on fire problem for both supply and demand?
I work at a startup marketplace where we clearly have a good solution for a hair on fire problem at the demand side, but our supply side isn't just that interested. They sign up, but their engagement is very inconsistent to say the least.
What problem does your marketplace solve for suppliers? Does it get them extra revenue? Is the amount significant to them?
Do they have to do something extra/different to work through your platform (e.g. different process, different service level, pay commission to you)? Is it still worth it?
Do they use it once and then stop? If so, just ask them.
It solves a problem, that will only get extra revenue at the long term, for which they have alternatives and has no incentives for continuous engagement (it is good enough to use it only once in a while).
When you have a marketplace, would it require a hair is on fire problem for both supply and demand?
I work at a startup marketplace where we clearly have a good solution for a hair on fire problem at the demand side, but our supply side isn't just that interested. They sign up, but their engagement is very inconsistent to say the least.