Some Chapters: 1. what cats do when you're away. 2. How you know your cat is annoyed with you 3. What cats do when you're asleep. 4. How many cat pictures should you post in a day/week/month 5. Indoor vs. Outdoor cats. 6. How to spoil your cat.
To build your platform, I'd first launch a podcast called Podcats, in which three "sisters from different litters" meow over topics of the day. You'd have 10M viewers within a month and sponsorships from American Express and Chewy. THEN do the picture book. And get three cats for the theater tour.
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I think I'll stop here.