My USB is basically gone after 'diskutil zeroDisk /dev/disk2'. What do I do?
There is so much going on with your operating system and in the comments, I would take the USB drive to another computer to test it. Then you can have possibly two follow on questions.
One to address erasing a USB or knowing it is flakey.
A second question where you ask how to get your Mac in a desired state. (Like how to erase install macOS.)