Hello and thanks for the question,, I kind of agree to certain point with Jason Kanigan. I would be sure to line up the "pre-qualification" with what YOU want from a client.

I am going to assume you've already gave a thought to all that and your qualification is correct.

I would definitely recommend you to start by creating rapport. You mentioned that you created a database of prospects that have used the service in the past, but NOT YOUR service, so I am sure many of them wouldn't like a direct approach trying to make them change services.

After that first contact you need to see which ones respond to that first contact and follow up with a "solution to their problem". Those who didn't respond you need to keep trying for them to respond a new point of view, a different approach to create rapport, once they respond you need to then "solve their problem"

To those who responded, tell them why you are a better choice, those who didn't try a different thing..

For those who did respond to the last one make an offer that they just can't say no, just for trying your service and handle objections beforehand..

-So contact them and create rapport,
-Solution to their problem
-Why You
-Close the sale

Customize your marketing, even those contacts who never responded, keep in touch by adding value to them.

Hope this helps you :)

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Have a great day!