your settings for Siri? I don’t use it but know people who do and Siri talks to them!

in the industry. You set up a call on the Apple website and they call you right back.

See also the excellent tech support notes on the Apple site.

I wonder if maybe your phone in accidentally in silent mode?

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker
https://support.apple.com/en-us/HT203794

The car like to hijack audio.

I'd like to tell you how to change the audio output device, but I can't find it.
I know that when I'm on a call, I can change the output to speaker, or headphones (mine still plug in)

One time, the GPS stopped talking, and (you guessed it) restarting the phone cured it.

Can't comment on Waze. Apple Maps have improved and get me where I need to go.

It's worth using the GPS just to warn when a required turn is ahead before I can see it.

I discovered that it would NOT talk if it was plugged in--an issue in my 2015 car having its phone charger connected to its radio system (Bluetooth), which is where the "talking" comes from. If I unplug it, it speaks to me.