Hey there! Building backlinks on high authority sites like Quora and Reddit can definitely help improve local rankings if done right. The key is making sure the backlinks are contextual and natural - you don't want to just spam links. I'd recommend checking out LinksClerk's backlinks from reddit I used them recently for my lawn care business and was impressed with the organic integration of links in relevant Reddit threads and Quora posts. It took a couple months, but I did see noticeable improvements in local ranking for targeted keywords. Just make sure to focus on quality over quantity - spammy backlinks could hurt more than help. Good luck with the new plumbing business!