Ubuntu 22.04: Switching network configuration from DHCP to static

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I don’t see DHCP4 being disabled, as config option named dhcp4: true still present on your netplan config file. You may also want to setup routes and nameservers in static IP configuration.

It can be done in Webmin using Networking ⇾ Network Configuration: Routing and Gateways and Networking ⇾ Network Configuration: Hostname and DNS Client pages.

After all your netplan config should look something like:

network:
  ethernets:
        ens3:
            addresses: ['185.132.42.12/32','109.228.35.223/32']
            accept-ra: true
            nameservers:
                addresses: [127.0.0.53, 8.8.8.8]
                search: [.]
            routes:
              - to: default
                via: 185.132.42.254  # may vary depending on your network configuration
  version: 2

Also, I would suggest to contact your ISP to help you to switch to static network configuration.

If you wish to do it on your own consider using ip route and resolvectl status commands to fill the right network configuration.

Additionally refer to this netplan manual: