Twenty Five years of experience in harnessing the power of Personal Computing for business and nonprofit organizations. Currently, a self-appointed evangelist for the "Lean Startup" methodology in all it's variations. An enthusiastic adherent of "Inbound Marketing" since 2009, I now blend the strengths of that methodology and "Lean" to create a more powerful and effective "Lean Marketing" process to generate measurable results sooner and with less effort and expense.
Ultimately you are offering a solution to a problem (a pain-reliever to someone's pain). Focus on that! Your message must communicate these two sides of the relationship.
Once this has been clarified (try using a Minimum Value Proposition Canvas to work it through), your next challenge is to determine what is the most effective medium to deliver your message to your target audience. Check out the Book Traction for some ideas on how to determine this.
NOW you final step would be to try a number of limited test experiments with multiple messages (text & graphics) targeted at your audience on the medium selected through the Traction process. It might sound like a lot of preparation, but doing your homework will give you the best "bang for your buck".
My most important suggestion to you is to look for Steve Blank's "Customer Development" process - try Steve's course on Udacity "How to Build a Startup". I'd be more than willing to provide you more details on how this process could benefit your practice both short term and more importantly, build a more successful long term practice in your community.
Wishing you every success. Yoel
My bias, as a Lean Startup evangelist, is to strongly recommend that you work through a Lean Startup / Customer Discovery process. You can find a number of free online workshops that can help guide you through this process. Steve Blank's course on Udemy comes to mind: https://www.udacity.com/course/how-to-build-a-startup--ep245
Feel free to ask any followup questions. It is EXACTLY for people like you with challenges like yours that the Lean Startup and Customer Discovery process were developed!
Wishing you every success.