If you notice, most status upload comes out with low quality and it is believed that WhatsApp reduces the quality of your photo and video when uploaded so as to enable viewers load it faster and to minimise WhatsApp server load. If you're looking for a solution to this, here are some of the things to do;

1. Clean your camera
To start, let’s go over the obvious: as you rub your phone on different surfaces (hands, clothes, tables, etc.), camera lenses get dirty. There’s no mystery here, just wrap the tip of a finger in a tissue and gently clean the lens. The improvement is instantaneous and takes 30 seconds.

2. Swipe through Instagram stories before posting
Now, let’s go to the dribbles. Instagram also compresses photos and videos before releasing them in Stories, but the loss of quality is less pronounced, depending on your cell phone model. Therefore, the tip is to play the content in stories first, then download it from there and put it in WhatsApp statuses. You don’t even need to post. You can even use Insta filters (and other tools) to add charm to your statuses.

3. Use some app to compress files
Do you know the tip of going through stories first, to use Instagram compression? It’s the same procedure, but in some other application that also does this. For example, InShot (available for Android and iPhone). In it, add to edit photos, and you can choose the resolution before saving video clips. In this case, remember WhatsApp limits for statuses: 30 seconds, 16 MB.

4. Post status from a conversation
Finally, instead of using the status camera or posting something straight from your gallery, you add a scale: some conversation. But the trick is when you send the content as an attachment in the chat because then WhatsApp doesn’t compress it.

To do this, you need to choose “document”, instead of “gallery” (on Android) or “photos and videos” (on iPhone). Thus, Whats pulls the contents of your cell phone’s file manager. On Android, they automatically appear in the manager. On the iPhone, you need to make them available in the Files app first.
Source: https://cubanvr.com/ways-to-improve-whatsapp-status-quality/