I used to have a number of R Datasets available for download and visual inspection. They were cloned from the datasets found in R, and I created Slickgrid-enabled webpages out of the data for easy inspection. I also added support for dataset management and basic statistical operations. At one point there were 3,000 visitors to the site every month.
The project was a part of Quadstat and Picostat which has since been dismantled, perhaps indefinitely. Information on the opensource version of Picostat can be found on Drupal. There you can find documentation on how to configure and manage a Drupal 8-based Quadstat image. You can create your own statistical applications with R as the backend.
If you find the datasets useful, you can star the Github repository above or contribute to the R project. After 15 years, I'm not planning on developing the project anymore. I learned alot about programming from Quadststat and Picostat and started my freelancing career on Upwork thanks to skills I learned.
It's certainly possible to make a living on Upwork freelancing. Over a 5 year period, I've made more than six figures working part-time. Although I didn't start from scratch: I did have education so that certainly helps but is not required.