Monetizing Diet Lead Prospects

Afternoon!

So my company produces thousands of new diet prospects a day, which we receive via affiliate traffic. Now I know there is a lot of money left on the table here and I am looking for some very effective ways of getting them monetized.
We've sent some e-mail reminders through mail chimp but ended up loosing our account. We probably even then didn't use the full potential of each prospect.
Some additional ideas I've had were..
- Creating a opt-in newsletter used to pitch other affiliate offers in the same niche
- Direct mail, reminding and selling prospects on our offer and potentially on external offers as well.
- Have a call center contact prospects to sell our/other products
- And something that i really don't want to do, but has floated around in my head as an option.. selling the leads.

Any suggestions/advise would be welcome.

I used to run diet offers and I generated 10,000 plus leads a day. Not matter what we did we couldn't generate much revenue off the email data. You don't want to use mailchimp, aweber, etc... they will all kick you off if you are mailing volume regardless if they are opt ins or not. Try using sendgrid SMTP.

Are you a member of a network that runs diet offers ?

I am connected to a call center that can upsell your buyers. They have over 20 different related products