A redesign should make your site stronger, not weaker. Most ranking drops are avoidable.
Keep your URLs where they are
Or set up clean 301 redirects when you have to change them.
Keep your content
Do not delete pages that already earn traffic. Update them instead.
Keep your structured data
Rebuild structured data so it matches the visible content of the new site.
Test before launch
Crawl the new site, verify redirects, check structured data, monitor after launch.
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