Some tips about the usage of JSON-LD structured data:
- Focus in the page content. Example: if the structured data describes a novel the HTML content of that page should be about that specific novel. Avoid the use of JSON-LD structured data to markup irrelevant or false content.
- Be mindful of schedules in those categories that needed, like events, business and organizations.
- When you add the URL of an image to your JSON-LD object be sure that the specific URL is in the page HTML source code.
- Avoid false reviews and qualifications. That is bad practice and will be penalized by search engines.