Speaking as a former field tech…
Something odd here. So I, too, would like to get more clarification on the current situation. 
If it’s only been five months, that should be a non-issue for a SmartThings set up, even if you moved everything to a different City. As far as Z wave and Zigbee devices, they should all still belong to the hub. That’s no different than somebody who has devices they only bring out at Halloween or Christmas and then put them away for a year again. Everything should start right up once you plug them into power again. Also, since it’s only been five months, they should all have been automatically transitioned to the new edge driver system. so…
Start by going to the advanced page of the official web interface to your SmartThings account and check what it says for the hub.
my.smartthings.com/advanced
- Does it say you have a hub?
- does it say that hub is operational?
- how many locations does it say you have?
- assuming you have a hub and it’s operational, how many devices does it say are connected to it?
- do your problematic devices show up in the device list, but you just can’t use them? Or does it not show them at all?
- do any other devices that use zwave or Zigbee show up in the device list and work OK?
If the problematic devices are in the device list, they just aren’t working in the app, it could be that the physical configuration of your network is different at the new location and they’ve gotten out of range.
if they don’t show up on the device list, but you have more than one location shown, check to see if any of them are on the other location.
if they don’t show up at all, then, either your hub or the individual devices were accidentally reset. It can happen. 
If that’s the problem, then you do need to individually reset the devices to make sure everything is clear, do a Z wave general exclusion for any Z wave devices, and then you should be able to add them back to the hub.
If the hub itself is missing, or non-functional, that’s a different situation.
Also, if you’d rather just start over from scratch, that’s certainly up to you. But go ahead and run through the questions I just asked so let’s make sure you don’t have any ghost devices on the account you’d have to get rid of Anyway, once you reset everything.