How can I get Google to pull in reviews from other websites to show on my Knowledge Panel?

Google will pull third-party reviews to a Knowledge Panel when the algorithm has sufficient confidence (data) that links those websites to your business.

There is no way to control this directly. You can help third-party reviews to be displayed in your Knowledge Panel by adding links from your website to those third-party websites with text similar to "see our reviews on these other sites." Ensure that the information on those sites is 100% correct and matches your Google Business Profile.

We recommend linking third-party sites to your social media, which may help. Connect as many dots as possible for the algorithm.