I've run a niche ecommerce website by myself for 10+ years as my primary income. It's down to about 5-15 hours of work per week. I'm looking to sell if anyone is interested.
https://news.ycombinator.com/item?id=21118095
The website is in the jewelry/gemstone space. The traffic is all organic and nets a few thousand dollars per month with no marketing, though could grow significantly with marketing and/or social media. Email is in my profile if you are interested.