If your roofing company is generating leads but not converting enough of them, don't immediately assume you need more traffic. You may need to fix what happens after the lead comes in. The goal isn't to chase every lead forever.
For a roofing company, GBP isn't just another online listing. It's often one of the first places a potential customer encounters your business. That first impression matters. But don't think about your GBP as an isolated SEO tactic.