I have numerous posts that mention "best practices" on our particular niche that all have different but similar content as each other. I'd hate to lose the old content, but what are the best practices for updating this content?

Most of the articles have a "best practices" section, so I can't just redirect the article to the new version altogether, but should I make sure that all articles are linking to the new one?

The rest of the articles are very similar to the most recent one we've written. Should we redirect them to the new one?

Okay, thank you. What if I were to change the alt text for all images to the article title? Or a few meta keywords from the article? Would that be helpful?

I think there may be too many to change the link text manually, but what if the link text was also the link? So instead of "a href=article.html>here" it might instead be "a href=article.html>article" ?

We have a rather large joomla site. It has upwards of 25k articles created over 20+ years. Our SEMRush report shows that we have probably a few hundred links that either have "here" as the link description or no link description at all. Most of the links are for external sites, not internal links.

How big of a deal is this? Is it worth the time to fix? Any tips on how to fix these most easily? I'm assuming the only real way to do it would be manually.