Make Relevant Notifications: it is important to make sure that every message adds value to the user and is worth a temporary interruption.
Timing is very important when it comes to pushing notifications. Send notification in correct time.
Do not send notifications when the user is asleep.
Avoid sending too many notifications in a short period of time:
Push notifications need to direct the user to the destination page
Companies no longer captivate their audience with simple, old, and boring messages that get lost in digital noise. Instead, marketers attract and maintain user engagement through humour
Check Brilliant Push Notification Ideas for Marketing