What do I need to change my bottom lip sticking out? (Photos)

When my face is in a natural position, my bottom lip sticks out and I think it’s from the soft tissue under my bottom lip. When I smile without my teeth, it bulges underneath my bottom lip. I’ve been doing research to try and find out what I need but I still don’t understand and also there doesn’t seem to be anything around my area either. I’ve had braces privately and the orthodontist said my teeth are the best they can be and won’t sort this problem out. Help!