Hello Tony,
I took a look at the postcard, and I can see what you need to change to make it more effective. I will be happy to change the wording so it is more effective. I will make sure the wording is clear, well-written, positive, and also states what your clients need to get your help. I will not ask you to change the layout at all, just the wording. I can finish the job within a day.
Let me introduce myself. My name is Julie Webb, and I’m a professional copy editor and proofreader with 36 years of experience, which includes working on a variety of sales and marketing materials, web pages, blog posts, business books and textbooks. English is my native language and my degree is in English.
You want excellent quality copy editing, and that's what I do! Here at Freelancer.com, my work has earned a 4.9 out of 5 rating from my 156 clients, as shown at https://www.freelancer.com/u/jw010699.html. I also work at Upwork dot com; my work has earned a 99% Job Success Score and the Top Rated Award. My clients' comments include, "Julie was very good with making suggestions as if she had real ownership in the project's success," "This is my third time working with Julie, she has done a good job and took care of the details. I definitely recommend her," and "This was really excellent work. I will hire her again."
I would enjoy tightening up the language on your postcard for maximum efficacy, and hope to hear from you soon.
Julie Webb