I have spent years fixing WordPress sites bogged down by technical debt. You do...

https://smoothdecorator.com/how-to-integrate-seo-with-social-media-marketing-stop-building-on-a-foundation-of-sand/

I have spent years fixing WordPress sites bogged down by technical debt. You do not need a big rebuild to boost rankings. Start by adding image compression for speed, adding internal links to old posts, and killing spam with Akismet