How to Increase Authority Flow with Relevancy Stacking

Everyone knows how important relevancy for both, on-page and off-page optimization. Nobody will build backlinks nowadays from irrelevant content, like you will not expect any ranking boost to your dog training site if you post links from auto-insurance content. But when it comes to a lower tier backlinks you should remember that rule is the same and if you want to give a relevancy boost to your PBN or another tier 1 properties you better post the content as relevant as possible to the topic.