Start a blog. I spent minimal effort making 5 blog posts a few years ago and it already pays for the cost of the domain through ads. Imagine what revenue 100 blog posts, or 1000 would bring in. https://www.codingwithricky.com/
I'll probably end up doing the same pretty soon: there's quite some money to be made in the sector I work+ no serious SEO work done by any of the main players,so a website with 100-200 blog posts would do nicely.
Interested to know the source of this income. Is it through affiliated links? Selling your product?