I haven't used your model of phone @Paresh521 however have you looked in the notification settings section and in the individual app preferences settings ?
I assume you haven't any battery saving settings activated too.
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "