Visiblity index taking a nosedive

Hey everyone, Our SEO visibility index dropped overnight from about 22% to 9%. I’m trying to pinpoint the cause. It translates to about 80% of the content taking a nosedive in rankings. We've lost almost all of our top 5 rankings, which is around 20 keywords. **Recent Changes:** * **Category tagging:** I added category tags to all blog posts, hoping to improve structure and navigation. Could this have caused indexing or canonical issues? * **Lazy loading on the blog main landing page:** Implemented lazy loading to speed up the page, but I’m worried it might be affecting how Google sees or renders my content. **Other Details:** * No major content changes aside from the above. * Crawl rates are normal and no known penalties. * No suspicious backlink activity. **Question:** Has anyone experienced sudden drops after adding category tags or implementing lazy loading? Any insights or troubleshooting tips would be greatly appreciated!