My methodology for this is a little different than what most tool providers post in their blogs and how-to articles. I start with the main topic (Chimney Repair) and put it on a whiteboard. Then I put a circle around it and start attaching other circles with related topics or industries. So one circle might be materials (stone, brick, etc.), another circle might be gas, which then connects to a circle labeled utilities, and then I might add another circle that attaches to the main circle titled home inspectors.
This is basically just brainstorming all the related and interrelated industries and blog topics. Now I'm able to clearly see a link between home inspectors and brick chimneys, and home inspectors and stone chimneys. See where I'm going with this?
Start doing outreach with home inspectors and pitching blog ideas like "3 Things Homeowners Should Check Inside their Brick Chimney Before Closing". Where to find home inspectors? Use Google Maps to look them up in and around Portland. You want the local links - they're more valuable by far and Google maps gives you a giant list of home inspectors with websites. From there you just curate the ones who have a blog.
It's easy enough to replicate this process for any industry in the local space. You just don't see it talked about because it doesn't require a tool beyond Google Spreadsheets and maybe something like hunter.io for efficiency's sake.