Why are my WhatsApp messages not showing until I open GB WhatsApp app?

My data is still not getting messages until I open GB WhatsApp: 

To ensure the prompt delivery of WhatsApp messages and notifications, your phone must be configured properly. If you have the same concern, wondering My data is still not getting messages until I open GB WhatsApp, there are many ways, but only a couple of them are thought to be effective. The details are discussed below. Kindly note these methods apply to everyone. If you are not receiving messages until I open GB WhatsApp, the background data is probably disabled, and you have to enable it for the app.

1-Make sure your phone has an Internet connection

2-Make sure background data is not restricted

   Open your phone's Settings app > Apps > WhatsApp > Data usage.

   Make sure gb WhatsApp background data is not restricted.

   Repeat the above steps for Google Services.

3-Make sure that Auto-sync data is turned on in your phone's Settings app > Data usage > Menu icon >     auto-sync data.

4-Make sure that Wi-Fi optimization is turned off in your phone's Settings app > Wi-Fi > Menu icon > Advanced > Wi-Fi optimization.

5-Make sure Do not disturb is turned off or you have allowed gb WhatsApp notifications in priority mode in your phone's Settings app > Sound > Do not disturb.

6-Make sure all of gb WhatsApp's permissions are granted in your phone's Settings app > Apps > WhatsApp > Permissions.

Also, read: Things not to do when using WhatsApp to stay safe.

How to increase the length of your Whatsapp DP?

WhatsApp is undoubtedly one of the biggest messaging services in the world right now and the company isn't done yet. 
But, there is a trick with which you can use the complete picture as your WhatsApp display picture. 

Read the following steps to know the complete process.

1. Square Droid:
Square Droid is one of the best photo squarer app. It allows you to resize any image to square size without crop. This app uses less than 3 MB of storage. Using the Square droid app you change the background; apply the blur and contrasting color effect to make pictures attractive. This app allows you to set the quality of pictures and save them into a different format.

2. No Crop for Whatsapp:
No Crop for WhatsApp is a highly customized pics editing app. This app adjusts the picture size to the maximum allowed without losing any part of it, to avoid cropped pictures. Using this app we can add blurred effects in the borders in order to keep a full-size image. we can load any picture from a photo gallery. we can set the size rotation and position of the picture using pinch gestures and sliding the picture.