There are certain conditions that tend to make a district competitive: proximity to a large military presence, a fairly well-off urban area, a government center. But you can’t do anything, at least in the short term, about the district you live in.
Here’s a simpler way to think about it: If there’s just one person whose WCS is better than yours, then you should consider your district competitive. It is, after all, a competition in which generally a district has just one appointee. Not to say there won’t be multiple appointees (that’s another post all together), but one superior candidate is all it takes to be competitive for you. Don’t overthink it and focus on what you can control.