A digital marketing audit might be necessary if you observe declining performance metrics such as reduced website traffic or conversions, increased CPA, or decreased social media engagement. Other signs could include inconsistent branding across different channels, low ROI, stagnant or declining search engine rankings, a lack of data-driven decision making, poor user experience on your website, ineffective content strategy, inefficient social media presence, lack of integration and automation, or failing to keep up with industry trends.