I wrote a post about 3 weeks ago. It is called Creating Toast API with React Hooks. Here is a link - https://aibolik.github.io/blog/creating-toast-api-with-react-hooks
I modified my blog post and content model so that I can include some promotions. I added promotion to 30-day-React, with immediate early bird sign up form. It brought me 4 leads. It was posted to dev.to, medium and shared in twitter.
In total, I have around 15 early-bird sign ups.