I'm not willing to share my sites, but I have some content websites, one of them have ~2 million pageviews/month and is enough to pay my bills. The others are small, but they improve ~10% my result.
They are 99% passive income. All of them can be improved, but I don't do anything, I have full time job and other side projects. I feel bad for not working on them, but I know it is the right decision to me.
To be honest, it was started as a SEO experiment. I have bad content in good shape (all in-page SEO tricks done). I'm sure better content can improve my results.