[jayec]

Keep doing what you're doing and get case studies and testimonials from your clients to prove that you solved their problems. As others have said, clients want their problem solved, not someone to do xyz. Prove that you can solve problems and progressively apply for bigger gigs until you're in a position where you need to put someone on to help you complete the project. If you do great work and progressively take on bigger challenges then eventually an agency will fall into place.