Ways to optimize your content:
Searchable title
Meta description
Keywords
Inbound links

You can refer to the information below:
impactbnd.com/blog/5-ways-to-improve-the-quality-of-your-content

Your website content should be unique and high relevant to your business. Content should be divide in parts and target keyword should be no more than 3% in single web page. You should also include heading tags in web page content to write high quality content.

Unique and quality content, Content must be user-friendly, It must be based on your product or services and Target quality keyword