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Internal linking done? Index page updated? Old blog posts updated?
Age can also have its downside. When no new content is published or when Google doesnt see the new content it looks abandon to the crawler.
If I was in your position I’d hail-mary it. Redesign the whole site (especially index where most of your juice passes through), keep the slugs, title and H1, revamp the content, improve the internal linking and do a little prayer as you relaunch.
Good luck.
