I was in your position a few years ago. I believed that my idea was great and that that meant I will easily be able to grow organically.

Couldn't be further from the truth. Sorry.

You've already recognised this so I won't dwell on it too much. What are your options from here: IMO, "guerilla advertising", AKA promoting your work on Reddit and Twitter communities. Don't overdo it. But without cold hard cash for marketing I don't know how far you'll get.

As for the actual idea... eh, I don't get it. At first I thought it's just crowdsourcing but then I read that people offer a service in return. Isn't that just... you know... a job? There was a similar idea that appeared on the UK show Dragon's Den (aka Shark Tank in the US), but it was more for getting a loan from family and friends.

I like the website design, very friendly and approachable.

PS: the example campaigns on your site are too obviously fake: way too much production value in those photos!