When you're feeling proficient and confident in something, move your goalposts, and force yourself to take the next step:

* Become proficient not just the concept or task, but good enough to where you can teach it to someone else, or write a clear and concise KB article.

* Implement it (perform the task) repeatedly, with consistent outcomes.

* Automate the process.

* Use this as one part of a much more complex system.