Crawl access first, because nothing else counts until pages are reachable
Check robots.txt, redirect chains, canonical tags and noindex rules. A page that cannot be crawled is invisible, and every hour spent rewriting it is wasted. Fix the access layer before you commission a single word of copy. This is the layer Technical SEO Services covers in detail, usually in the first week.
Done signEvery revenue page returns a 200 in a full crawl, appears in the XML sitemap, and sits within three clicks of the home page. Re-crawl a week later to confirm the fix held.