Two of my site's traffic dropped by 40%. One of them is 6 years old. Both have original content. I never even thought about gaming the system. I couldn't figu

Two of my site's traffic dropped by 40%. One of them is 6 years old. Both have original content. I never even thought about gaming the system. I couldn't figure out what triggered this. One of the site has the perfect landing page that user is looking for the queries. I don't understand how this change could improve the quality.