Falling email open rates can happen for several reasons. Sometimes people lose interest if you send too many emails or the subject lines sound repetitive. If your messages often go to the promotions or spam folder, fewer people will even see them. Some users might also change their email habits or ignore marketing messages. It helps to test different subject lines that sound friendly and clear, not pushy or clickbait-like. You can also clean your mailing list by removing inactive subscribers who haven't opened your emails for months. Sending your messages at better times, like mid-morning during weekdays, can also make a difference. Small updates like these often bring attention back to your emails.