Do the below and never try this again!
valet uninstall
composer global remove laravel/valet
sudo rm -rfv /usr/local/bin/valet
sudo rm -rfv ~/.valet
brew rm -rfv nginx php@7.2 php@7.3 dnsmasq
sudo rm -rfv /usr/local/Cellar/dnsmasq
sudo rm -rfv /usr/local/Cellar/nginx
sudo rm -rfv /usr/local/Cellar/php*
sudo rm -rfv /etc/resolver/test
Don't forget that after uninstalling you might have some daemon services running - fx. nginx - so make sure to stop them if you've uninstalled them.