That’s right. In order to sort out different reasons for the problem, I’d also suggest to try the device again in a zone where several gateways should be reachable. If there is still no connection, I would suspect a hardware problem with your node.
For further investigation into the problem it’d probably be best to contact TTN community people nearby who can help with gateway logs, SDR debugging, different nodes for testing at your place, general advice, and more.