So it sounds like of like Upwork/Fiverr/etc, but with a story about why the person is trying to raise money, and an end date/amount for their offer? As an end user, what is the advantage to me of using a smaller platform like this (with far less users) compared to one of the established ones that have a much larger number of potential buyers? And if I'm making decent money through your platform, why would I want to stop when I reach the $1000 goal (or whatever I set)?
And as a buyer, what kind of checks and verification do you perform so that I can trust the service I'm buying? If I hire a babysitter or a tutor, have you done background checks? Are you going to be liable (or get sued) when something goes wrong, or the builder I hire does a shoddy job? Can I get a refund if I'm not happy or the service isn't delivered? What happens if I don't pay - is the seller just left out of pocket or will you cover that?
If you're pushing the local angle (which quite a few of the examples you give are), can I easily see all the local services being offered without having to sign up? If you're trying to go down that route, then you might want to think about marketing locally and trying to get a load of people in your own local area involved, before trying to launch to the wider global market.