Stop all containers if they are running from the AIO interface
Stop the mastercontainer with sudo docker stop nextcloud-aio-mastercontainer
If the domaincheck container is still running, stop it with sudo docker stop nextcloud-aio-domaincheck
Check that no AIO containers are running anymore by running sudo docker ps --format {{.Names}}. If no nextcloud-aio containers are listed, you can proceed with the steps below. If there should be some, you will need to stop them with sudo docker stop <container_name> until no one is listed anymore.
Check which containers are stopped: sudo docker ps --filter "status=exited"
Now remove all these stopped containers with sudo docker container prune
Delete the docker network with sudo docker network rm nextcloud-aio
Check which volumes are dangling with sudo docker volume ls --filter "dangling=true"
Now remove all these dangling volumes: sudo docker volume prune --filter all=1 (on Windows you might need to remove some volumes afterwards manually with docker volume rm nextcloud_aio_backupdir, docker volume rm nextcloud_aio_nextcloud_datadir).
If you've configured NEXTCLOUD_DATADIR to a path on your host instead of the default volume, you need to clean that up as well. (E.g. by simply deleting the directory).
Make sure that no volumes are remaining with sudo docker volume ls --format {{.Name}}. If no nextcloud-aio volumes are listed, you can proceed with the steps below. If there should be some, you will need to stop them with sudo docker volume rm <volume_name> until no one is listed anymore.
Optional: You can remove all docker images with sudo docker image prune -a.
And you are done! Now feel free to start over with the recommended docker run command!