Recently moved and have a new router/network config

I've recently moved to a new rental home, and now I have a different router with a different gateway. Sadly, before moving, I did not know what network settings I would be inheriting and therefore could not edit my Proxmox VE server's network config to that of the new settings. Now, I'm able to turn on my proxmox server, but can't access it via SSH or GUI because of the previous network config.

I'm relatively new to proxmox and feel stuck. Does anyone know what I should do???