Interlink your 3 content pillars to each other

Interlinking your established content pillars where genuine topical connections exist extends the same underlying principle that makes individual pillar-to-cluster linking valuable — reinforcing real content relationships through explicit, crawlable links — to the broader relationships between your major topic areas themselves, strengthening the overall coherence of your site's demonstrated topical authority.

The genuine relevance requirement here matters as much as it does at the cluster level, arguably more so given the broader scope of pillar content — forcing a connection between two pillars that don't have a real, natural relationship reads as an artificial attempt to interlink for its own sake rather than a genuine reflection of how these topics actually relate to your business and your content's coverage of them.

This linking work is deliberately secondary to the core pillar-to-cluster structure, which should remain the primary organizing principle of your internal linking strategy — pillar-to-pillar connections are a genuine reinforcement layer on top of that primary structure, not a replacement for it, and should be pursued specifically where real, natural connections exist rather than as a comprehensive requirement to link every pillar to every other pillar regardless of actual relevance.

The cumulative effect of these cross-pillar connections, applied only where genuinely warranted, is a site structure that reads as a coherent, interconnected body of expertise rather than a collection of separate, isolated topic silos — which is precisely the kind of demonstrated, comprehensive topical coherence that search engines' increasingly sophisticated topical authority evaluation is specifically designed to identify and reward.