Case study of a solo founder who built HelpKit, a profitable software product that turns Notion pages into professional knowledge bases, surpassing his goal of $3K MRR by another $2K, and shares his process of building the MVP using Figma and a landing page to validate the idea, launching on Twitter, and growing through sharing his story on Reddit and Indiehackers, creating free tools like Notion Simple Table Generator, building on a growing niche, getting to know his customers, and accepting slow growth.