LogoAi just crossed $5k MRR last month. It too about 4 years to reach this goal. I spend about 1 hour everyday (on average) on this product chipping away small enhancements and new features. I recently added a new favicon feature. You can create a nice looking favicon from any text or image. https://www.logoai.com/png/favicon
This is my new marketing strategy for LogoAI - building free tools off the technology we already have in order to attract new users and customers. I have couple other ideas in the making and will announce when they become available.