5 systems that turn your expertise (and book) into sustainable income

Build Your AudienceDigital MarketingEmail Marketing
Updated: December 17, 2025
5 systems that turn your expertise (and book) into sustainable income
13 min read

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Cait Miller
Cait Miller

Cait is a Senior Content Marketing Manager at Kit. She's a lifelong storyteller and writer with more than a decade in the creator space. Outside of work you can catch her running marathons, hiking, knitting, painting, or catching some live music. (Read more by Cait)