Hey there CharleyX3,
Welcome to Apple Support Communities!
We understand you have an issue with the camera being blurry. We'll be glad to assist you with this.
It's possible the focus or exposure may be locked causing this issue. Please follow section "Adjust your focus and exposure" here: About the Camera features on your iPhone
Do you experience this in various lighting and environments? If so, try to Adjust HDR camera settings on iPhone.
We also have steps here that can help: If the camera or flash on your iPhone, iPad, or iPod touch isn't working
This includes removing the case from your iPhone. Sometimes the materials in the case may cause issues with the camera.
Test the quality with the different camera modes: Use camera modes on your iPhone, iPad, and iPod touch
Kind regards.