Detected – Not currently indexed – how to fix this?

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Detected – Currently not indexed, this is a big problem for site pages
If nothing is done with the site, then these pages will most likely remain with this status.
I have a lot of such pages discovered after:
After translating the site into a second language (from Russian to Ukrainian). At a fast pace, when I just copied everything and translated with the help of an online translator. In this way, the pages lost a bunch of headers except the main one (I did not format the pages).
Moved the site to another system.
Changing URLs of pages.
301 redirect to the page.
Detected – Not currently indexed – how to fix this? How did the correction and subsequent indexing of these pages begin?
These are all my assumptions and work, with your site everything may be completely different.
You need to view all pages separately. Check for errors as in the text (if there is an online translator, then most likely there are them).
It is necessary to mark up the page using tags such as h1-h3. Add a photo to the article.
The page should be optimized for some request. If the name title is one, h1-h3 are the second, and the text does not have a semantic reflection of what is written about.
You need to add links to the second pages of your site.
301 redirect to the page should be removed if the search engine already sees the page, and there is no traffic from the old page.
After the correction, the pages gradually appear in the Google index. The number of pages with the status – Detected – currently not indexed is decreasing.