When migrating from HTML to WordPress, the main thing to be kept in mind is the permalink structure. By default HTML pages have the extension of
.html while WordPress URLs have no extensions. (You can activate them though).
Now Google treats a
www.example.com/page as two different URLs.
Generally, there are two options:
Change the Permalink structure of all pages.(There are plugins for that)
Redirecting using 301.
Since you have already implemented 301 redirects. So,you must know that using a 301 redirect can lead to losing 15 percent of your "link juice." Many sites quote Matt Cutts, Google’s head of Web spam, as having made that statement.
How to avoid negative SEO because of offline website?
When Googlebot crawls your website while offline instead of returning an HTTP result code 404 (Not Found) or showing an error page with the status code 200 (OK) when a page is requested, it’s better to return a 503 HTTP result code (Service Unavailable) which tells search engine crawlers that the downtime is temporary. Moreover, it allows webmasters to provide visitors and bots with an estimated time when the site will be up and running again.