Refrain from bombarding users with repeated notifications for the same event, even if they haven't responded immediately. Users engage with notifications on their own schedule, and overwhelming them with multiple alerts can lead to frustration. For instance, consider a messaging app. If it sends repeated notifications for an unread message without allowing time for users to respond, it may flood their screen, potentially prompting them to disable all notifications from the app.

Utilize techniques such as notification grouping, where related notifications are bundled together, or employ reminder notifications after a reasonable period. For instance, in the messaging app scenario, consider sending a reminder notification if users haven't opened the message after a set time. Additionally, provide users with customizable notification settings, allowing them to choose the frequency and type of notifications they prefer.