The best to improve SEO on WordPress is to use a dedicated WordPress SEO plugin such as Yoast SEO or Rank Math. These two plugins are currently the best available and will show you in an easy to follow way how your pages can be improved.
They both have free and premium versions with great documentation to help you get started quickly.
You should also make sure you are using original content such as pages, blogs and descriptions along with optimising your images.
