Hi,
Here’s a YouTube video showing removing of mainboard:
https://m.youtube.com/watch?v=gzVEoeGeZwg
The USBC port is a standard connection which you should be able to purchase at electronics parts store or online.
You will need to have tools/skills to de-solder and remove the broken one then solder in the new one.
If you’re not comfortable with doing this then you may need to consider taking it to a repair shop.
Hope this helps