To reduce the spam score of your website, follow these steps:

1) Regularly monitor your site for spammy content and remove or disavow it.
2) Improve your site's security measures, such as using CAPTCHAs and implementing strong user authentication.
3) Monitor and clean up your backlink profile by disavowing low-quality or suspicious links.
4) Avoid keyword stuffing and maintain high-quality content.
5) Regularly update your website and plugins to stay secure.