A website I work on has a bunch of old, really poorly written content. The guy who made all these posts wasn't much of a writer, it has grammatical errors, he uses first person, etc. Worse, none of the posts are optimized and they use a ridiculous link structure where the posts are just numbered.

What are my options here?

I really don't want to go back through to edit and optimize because it would take ages and nobody is viewing this content anyway (each post might get 20 page views in a month).

I've considered just deleting all of these old posts and then setting up redirects to the homepage or to the "news" blog landing page. But I'm not sure what the impact of that might be in terms of the site's health and domain authority.

Is there another way to deal with this?