Several elements should remain consistent to ensure your email marketing strategy is effective: - Subject Lines: Develop a recognizable style or format for your subject lines to make your emails easily identifiable. - Design and Layout: Use consistent templates, colors, and fonts to create a cohesive visual experience. - Tone and Voice: Maintain a consistent tone and voice that aligns with your brand's identity. - Sending Schedule: Stick to a regular sending schedule so your audience knows when to expect your emails.