The folder that you cloned from github for the mic hat driver installation also includes an uninstall.sh. Execute that one to uninstall. Make sure to remove the asound.conf afterwards with sudo rm /etc/asound.conf as if i remember correctly the driver uninstall process doesn’t always remove it.
Another thought would be to set up a fresh raspberry pi os on a separate sd card just to make sure it isn’t due to any conflicts with other software you have installed.
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