Changing to static IP at the command line (see also: Netplan sucks)

Good choice : Install ifupdown or whatever. YAML it's a terrible file to edit by commandline.

Bad choice : use chatgpt to generate your network configuration

Netplan is pretty simple for what it is. All you need is the interface, address, and route, maybe DNS if you don’t want to set that up another way. Because it’s yaml, spacing matters, so watch that. You can use netplan try which will automatically revert if you don’t give it any input for a certain amount of time.

network:
  renderer: networkd
  ethernets:
    ens33:
      addresses:
        - 192.168.1.247/24
      nameservers:
        addresses: [4.2.2.2, 8.8.8.8]
      routes:
        - to: default
          via: 192.168.1.1
  version: 2

https://netplan.readthedocs.io/en/stable/index.html