Sound level - quality

Whenever I put my Soundcore Liberty 4’s in, and connect them to my iPhone 13 Pro Max, they work, however everyone on the other end have a hard time hearing me. It’s usually said I sound like I’m talking into a can or box.

I’ve cleaned the mic locations, updated the firmware, and even checked my iPhone is updated and connected properly. I’ve turned up the volume and still.

Please help

I’d recommend contacting Support to see if they have any recommendations.