After years of technical cleanups, I know SEO is just plain housecleaning....

https://bizzmarkblog.com/should-i-remove-or-redirect-broken-links-in-old-blog-posts/

After years of technical cleanups, I know SEO is just plain housecleaning. Compressing images and using Broken Link Checker to fix 404s makes a difference. Adding internal links to older posts helps Google crawl better