Recommend a good USB-C to 3.5mm audio dongle
The last two I tried had some of the crappiest sounding audio I've ever heard out of a premium phone. I have a $100 wired headset I'd like to use.
if ankhor has it then get it
I use Anker's $15 "USB C to 3.5mm Audio Adapter, Male to Female Nylon Cable for Samsung S20/S20+/S20 Ultra, Pixel 4/+ 4XL, and More Type C Devices" in my 6a with my m40x's for music streaming and it is good enough(tm) so far
I recommend Ugreen over Anker after all that nonsense with their home security system.
You could try the other way and get a Bluetooth adaptor to plug into your wired headphones? You might get better sound quality that way.
Google's one is £15
Apple's one is £9