Google's helpful-content guidance rewards content created primarily to help people (not to game search) and can suppress an entire site when a large share of its pages are thin, unhelpful, or off-topic. That makes site-wide quality a real ranking factor, not just page-by-page relevance.

Content pruning is the remedy: identifying low-value or off-niche pages and improving, consolidating, or removing (noindex or delete) them so the remaining content represents the site more accurately. For a specialist brand, pruning generalist legacy content often lifts the pages that actually matter.