Two things, Provide internal links from your blog posts. Win some traffic for those pages in whatsoever way you can. These will speed up the indexing process.

Please provide the example link of the SERP to analyze further.

Yes, you can use it so.

You will have to find your own way to update the content so that the changes made might add some value to overall content. Play with user experience. Always try to improv...

Temporarily remove the URL by using Removals section of the Google Search Console. This will resolve the issue.

In such a case, how to let Google know the original post is the cornerstone, while the other post that is linked to is NOT? Using nofollow or other attributes?

Thank you very much.

Very broad question without tiny bit of a detail. What kind of site are you talking about?

Invest in your content. Make it unique and give your visitors a good experience. Has you engagement rate changed?

If the link is relevant and it's helpful for your visitors, just do it. Internal linking is a great way to enlarge your visitors dwell time. A lot of SEOs believe that Go...