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Hey there! Here are some resources that might help you solve 4XX errors: https://moz.com/community/q/report-issue-4xx-client-error https://moz.com/community/q/pages-with-4xx-client-error-in-high-priority-issues https://moz.com/community/q/getting-4xx-client-error-404-not-found-errors-from-moz I hope that helps!

Hi, This question asked several times in this community. I'm sharing few of them https://moz.com/community/q/improve-page-authority-or-domain-authority https://moz.com/community/q/how-to-increase-page-authority-3 https://moz.com/community/q/steps-to-improve-page-rank-and-domain-authority Hope this helps. Thanks