Identifying irrelevant variables involves understanding what truly drives engagement and conversions for your audience. This can be done through data analysis and understanding your key performance indicators (KPIs). A/B testing methods can be used to isolate and identify which variables have the most significant impact on your open rates, click-through rates, and conversions. For instance, if changing the font style from Arial to Times New Roman doesn’t show a measurable difference in engagement, it can be considered irrelevant.