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What about: having a good business model? knowing you audience? having the right people for the job? setting proper expectations? All those things come after the 3 things you mentioned?

Hi - Thanks for posting! Moz's Spam Score is the percentage of sites with similar features we've found to be penalized or banned by Google (it's not based on the spam score of the sites linking to you). To improve this score I would recommend reading our guide which explains the 27 factors used to make up this score. You can then look at your site and investigate areas you would like to improve on your site: https://moz.com/help/link-explorer/link-building/spam-score Best of luck, and let me know if I can help with anything else!