Max volume on iPhone too low

Hi L,
I cannot recall the exact path for this. however in the radio screen push the button for the settings, it would be under general, or phone, and you will see an option for volume, and there should be 5 levels there, 1 being the lowest, and 5 being the loudest, simply move the button to the next level until you are satisfied. this will also affect, your navigation details from car play/android auto and Siri or android assistant volume.

keep in mind audio volume for media is controlled partly by the phone volume setting and will not be affected by the above setting adjustment.

Thank you Bernie for your response. As per your suggestion I did go into the radio screen and under sound found something called “automatic sound levelizer” It was set at low so I changed it to mid. Hopefully it will make a difference. Again thank you.