Follow this script for installing the LXC : https://community-scripts.org/scripts/cloudflare-ddns
Do the setup as you would normally, add your api-key, at least 1 domain and the questions after.

If everything went well, this file should be available /etc/systemd/system/cloudflare-ddns.service

Download the file from this gist with wget https://gist.githubusercontent.com/noahbleau/bfc19ed738829b2a55adbfd502266037/raw/edit-ddns-domains.sh or create the file with the name of your choice (ex.: edit-ddns-domains.sh) with nano or your favorite editor and add the following:

This folder contains two Python scripts that automatically organize your TV show files into clean folders, ready for your media library.

/DIRECTORY
├── organizeFlixtor.py
├── organizeFormated.py

1. Remove local-lvm : Datacenter > Storage > local-lvm

2. Access the shell : Datacenter > node > Shell

   a) lvremove /dev/pve/data

   b) lvresize -l +100%FREE /dev/pve/root