Too much information can overwhelm the reader and dilute the impact of the core message. Marketers should focus on presenting key information that drives the desired action. 

A/B testing is crucial in direct response marketing to identify what resonates best with the audience. Many marketers make the mistake of not testing different elements of their copy, such as headlines, CTAs, or offers.

A strong and clear CTA is essential in direct response copywriting. Failing to provide a compelling and specific next step can lead to a lack of engagement and conversions.