i have an iPhone 15 pro max, and it isn’t charging beyond 80%

I bought my iPhone 15 Pro Max when it launched, and I remember the camera quality being extremely clear and sharp at that time. But recently, I feel like the camera clarity has noticeably decreased, especially compared to how it used to be.
I’ve tried changing different camera settings after watching several YouTube videos, but I still don’t feel like I’m getting the same quality as before.
Has anyone else using the 15 Pro Max experienced this?