Focus on crafting compelling subject lines that maximize email open rates, as they significantly impact your engagement. Start your subject line with numbers; using a number can increase open rates by about 20% due to its authoritative appeal and clarity. Additionally, capitalize the first one or two words to draw attention, which can elevate open rates by approximately 15%. Employing emojis is another effective strategy; less than 5% of promotional emails use them, yet incorporating an emoji can enhance open rates by more than 25%. Testing these techniques can yield substantial improvements in email marketing success.