In job hunting you play the role of salesman and the hiring authority plays the role of buyer. Therefore, as in any sales situation, you should put the focus on the prospect, not on you.
What you want to convey is that you are making an overt offer to be of service, not a thinly-veiled attempt to SELL your services. The prospect wants to know what's in it for them. They know what's in it for you - which is, in this case, a job.
Send a Marketing letter directly to the hiring authority and tell him or her about some of the benefits and advantages you can offer them ... as the RESULT of your background. Tell them about some of the capabilities you can bring to the table to help them and the company reach more of their financial goals faster. E.G. maybe you're pretty good at convincing people to make purchase decisions based on VALUE, not just price. Maybe you don't have to discount your price very often. Maybe you very good at increasing sales to existing accounts, not just in opening accounts.
Close by telling them that if it sounds like you might be of service, you'll be glad to come by for a brief visit to tell them more about what you can do for them.
