The mistake I would prioritize is treating SEO as an app-installation task instead of matching useful pages to actual buying intent. An SEO app can help with repetitive work, but it cannot decide why a customer should choose your collection or product.
Start with a few commercially important collections. Check that each has a clear purpose, useful product selection, helpful copy and internal links from relevant navigation or guides. Improve the product pages underneath them with original specifications, sizing, delivery and return information.
Then check technical blockers: indexability, accidental redirects, conflicting structured data and slow mobile interactions. Avoid changing every URL at once or adding multiple tools that output the same SEO elements.
Measure non-branded search impressions and clicks alongside landing-page conversions. Compare a sensible period and account for seasonality; more traffic is not automatically more profitable traffic.
For AI-assisted discovery, clear, accurate catalog data is a sound foundation, but nobody can promise inclusion. Which pages currently receive impressions without enough clicks or sales?