If a site has high DA and DR values above 50, it indicates it has good authority and backlinks. However, if Ahrefs shows zero traffic, it likely means the site doesn't get many visitors.
For guest blogging, traffic is important because you want your content to reach an audience. A site with high authority but no traffic may not be the best choice.
You should look for sites with both high authority metrics and decent traffic numbers. Prioritize sites that can drive relevant visitors to your guest post.