Once your first product generates consistent $5,000+/month revenue with a strong review base (50+ reviews, 4.2+ rating), it is time to launch a complementary product to the same customer base. Analyze your first product's customer reviews for complaints and feature requests—these are roadmaps for improved versions or complementary products with built-in demand. Horizontal expansion (similar products in the same category) is faster and lower-risk than vertical expansion (entirely new categories) because you leverage existing keyword knowledge and advertising data. Aim to build a catalog of 5–10
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