I am independent research consultant and I need to write a marketing letter.
How do I write a letter that will stand out ?

You might want to consider doing a promotion rather than a letter. People like to get stuff, and it will showcase your creativity.

Hi, r goddess!

If you would like to post a draft of such a letter here, without putting any contact information in it, I'm sure that there will be those of us who'll be willing to advise you as to how you could make improvements to it.

Thanks!