@aireo, one often heard advise to hone those technical writing skills is to start a technical blog where you document what you have learned/investigated. If you use GitHub pages (free) to host the blog, you’ll learn some git and static site generation based on markdown as well.

Viewing this blog as your own “external memory” or a place where you document your journey can help to overcome some of the factors that may be blocking when aiming to write for a general (developer) audience.