Best ways to build awareness.

Hey all! We are working on our beta product Tribeworks.io, a shared services platform that handles invoicing + collections, guarantees payment, simplifies taxes, and offers health care for freelancers. We are a small (3 person) team and started the service because we all understand how peerless freelance and contract work can be. We are bootstrapping and stretched for capacity. With everything that is going on with COVID-19 we have decided to try to move up our launch as more people are going to be turning to freelancing.

My question: What have other folks found to be the most impactful channels for building awareness with freelancers or soloprenuers.