Shopify SEO Recovery Audit, Traffic Dropped After Site Cleanup / URL Changes

I run a Shopify furniture store that lost the majority of its organic traffic after I made significant changes: I updated product URLs, titles, meta descriptions, alt text, and tags across the store, and set up 301 redirects. Since then, organic traffic and sales have dropped sharply and have not recovered. I need a one-time technical SEO audit (not an ongoing retainer) to diagnose exactly what caused the drop and give me a prioritized, plain-English action plan to recover. Specifically, I need you to: - Review my Google Search Console data (I will grant access) to determine whether impressions dropped or only clicks, and whether pages fell out of the index - Verify whether my 301 redirects are actually working correctly and pointing to the right pages - Identify which keywords and ranking signals were lost in the changes - Tell me clearly whether this is recoverable on my existing domain, and what the recovery steps are, in priority order - Deliver a written summary I can act on Important context: My store sells furniture in a category where I had to remove certain trademarked brand terms for legal reasons. So the recovery plan must rebuild traffic using descriptive, non-trademarked keywords. I cannot simply re-add the branded terms. Please confirm you understand this constraint. This is a defined one-time audit with a clear deliverable. Please tell me your relevant experience with site migration recovery and Shopify, and your flat fee and timeline for this audit.