Why limit the scope of your advertising sales? If you put most of your time and energy into generating entry-level leads, then it's time to change things up a bit.
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If you’re thinking of monetizing your email newsletter, then you might want to consider looking for sponsors. Securing a good sponsorship deal can be beneficial for everyone involved. For you, of course, it will mean generating revenue. For your sponsors, it will mean access to ready-made audiences, which in turn will get exposure to new brands, products, or services that give them value.