Agree on stack overflow. And part of learning how to program is trying to structure logic into thoughtful questions.

With R specifically I’d recommend looking into the tidyverse library for R. Or at least understand the libraries your work environment will be specifying to make sure you’re on the same page.

As others have mentioned - I would second. A good website. Let them come to you. Give your solutions to common problems. Create a github. Provide repeatable examples on your GitHub and encourage contact for custom solutions.

This won’t be a multi million dollar business. At best you’ll give yourself some work to get your name out. Companies don’t talk to each other - but maybe your niche is different. This is really the only path I can see without attaching yourself to a larger entity.