How to replatform without losing half your traffic

The Three Risks That Kill Migrations

Eighty-three percent of platform migrations fail or exceed their budget. The failures tend to cluster around three problems, and most teams only plan for the first one.

The first is SEO traffic loss from botched URL redirects. Every product page, category page, and landing page on your old site has a URL that Google has indexed. If those URLs change during migration and you don't set up proper 301 redirects, Google drops them from the index. Traffic disappears overnight.

The second is data integrity failure. Customer accounts, order history, product metadata, reviews, subscription records. Moving all of it from one system to another without losing or corrupting data is harder than most teams estimate. A single malformed CSV import can wipe loyalty tier assignments for thousands of customers.

The third is the lift-and-shift trap. Teams migrate their broken workflows unchanged to the new platform. The checkout flow that was losing conversions on WooCommerce gets rebuilt identically on Shopify. The product page layout that buried key information moves over pixel for pixel. You spend six months and six figures to end up with the same problems on a newer system.

The URL Redirect Problem

WooCommerce makes this especially painful. WordPress lets you configure permalinks in multiple formats, which means two WooCommerce stores almost never have the same URL structure. Some use /product/product-name, others use /shop/category/product-name, and others have entirely custom structures built by whatever developer set up the site.

Every one of those URLs needs a 301 redirect to its new location. Miss a few hundred and you lose a few hundred indexed pages. Miss a few thousand and you lose a meaningful chunk of organic traffic. The redirect map needs to be complete before the migration happens, tested in staging, and verified after launch.

Category pages are where most teams slip up. Products get mapped because they are obvious. But category pages, tag archives, paginated listing pages, and blog posts often get overlooked. These pages frequently carry significant search authority, and losing them means losing the long-tail traffic that feeds your discovery funnel.

The Structured Data Problem

In 2026, your store serves two audiences. Human visitors browse product pages and make purchases. AI shopping agents from Perplexity, ChatGPT, and Google crawl your structured data to decide whether to recommend your products.

A mishandled migration can cause what the industry calls agentic invisibility. Your products were showing up in AI-generated shopping recommendations before the migration. After the migration, the structured data is missing or malformed, and AI agents can no longer parse your catalog. They stop recommending you.

This means your structured data audit needs to happen before migration, not after. Every product page needs valid JSON-LD Product schema with price, availability, ratings, and detailed descriptions. FAQ pages need FAQ schema. Review content needs Review schema. The new platform needs to generate this data correctly from day one, not as a follow-up task three months post-launch.

The Pre-Launch Checklist

Before you flip the switch, five things need to be verified and documented.

A complete URL redirect map covering every indexed page on the old site. Test it in staging by crawling the old sitemap and verifying that every URL resolves correctly on the new domain.

A structured data audit on every page template. Run Google's Rich Results Test on each template type. Compare the structured data output of your old site against the new site for the same products and verify the data matches.

Google Search Console verification on the new domain or URL structure. If your domain is changing, use the Change of Address tool. If only the URL structure changes, submit the new sitemap and monitor the Index Coverage report.

Canonical tag management across the entire site. Every page should have a self-referencing canonical tag. No duplicate content should exist between old and new URLs during the transition period.

A monitoring plan for the first 30 days. Define what you will track and what thresholds trigger action.

The First 30 Days

The migration is not complete on launch day. It is complete when your traffic, rankings, and conversion rates have stabilized on the new platform.

Monitor organic traffic by page daily for the first two weeks, then weekly. A 10 to 15 percent dip in the first week is normal as Google recrawls and reindexes. A 30 percent dip that persists into week two means something is broken.

Watch crawl errors in Search Console. A spike in 404 errors points to missing redirects. A spike in soft 404s means pages exist but return empty or thin content.

Track your indexed page count. It should recover to pre-migration levels within two to three weeks. If it plateaus significantly below the old count, pages are being excluded from the index.

Check AI referral traffic separately. If Perplexity and ChatGPT were sending traffic before the migration, verify they still are. If that traffic dropped, your structured data needs attention.

The difference between a successful migration and a damaging one is almost always preparation. The teams that build the redirect map, audit the structured data, and set up monitoring before launch day recover their traffic within weeks. The teams that treat these as post-launch tasks spend months trying to get back to where they started.