How to make sounds louder for the hearing-impaired on iPhone 14 Plus?

Here are some of the available hearing-related accessibility options, including Visual Alerts and Headphone Accommodations:

• Hearing accessibility features in iOS - Apple Support

You can obtain additional accessibility help directly from Apple, as well.

JulesPules wrote:

Make notifications louder for hearing impaired

Small speakers can only push so much air, which is what makes sounds. If they aren't loud enough, perhaps you should consider wearing hearing aids?