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• Use SEO crawling tools like Screaming Frog
• Identify new keyword opportunities and ensure your content aligns with.
• on-page elements like title tags, meta descriptions, header tags and more
• technical issues such as site speed, mobile-friendliness, and indexability
• user experience of your website
• Identify content gaps on your website compared to top-performing competitors

I hope so it's help you.

React this not cost you

Simply create create an action plan for do seo audit

First You Need to check for SEO Audit.

• On Page SEO

• Technical SEO

• Off Page SEO

There is lots of tool available on internet to audit Website. You can also use Moz tool for Review backlink, DA/PA, Spam score and more with Moz Premium.