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this depends on how you installed it

Idk but this world is near to end 😔

https://wiki.servarr.com/readarr/installation/linux

Uninstall

To uninstall and purge:

    Warning: This will destroy your application data.

sudo systemctl stop readarr
sudo rm -rf /opt/Readarr
sudo rm -rf /var/lib/readarr
sudo rm -rf /etc/systemd/system/readarr.service
sudo systemctl -q daemon-reload

To uninstall and keep your application data:

sudo systemctl stop readarr
sudo rm -rf /opt/Readarr
sudo rm -rf /etc/systemd/system/readarr.service
sudo systemctl -q daemon-reload

Never just delete stuff from Linux unless you know what you're doing. Always remove it using the method you installed it with.