Sources

MagazineManager – Best Lead Magnets for Publishers (2025) (recommends new magnets every 2-3 months, focus on quality 3-4 magnets)

WPBeginner – Lead Magnet Tools FAQ (test new magnets every 3-6 months; watch conversion drops as a signal)

Designrr (FAQ) – Lead Magnets: Why They Fail (optimize one high-performer before many)

EngageBay – Lead Magnets 101 (promote evergreen content regularly, update if evergreen)

WPBeginner (via search result snippet) – emphasis on keeping offers fresh and engaging while gathering data (implied in text)