Since everything is gone now it’s probably too late to state the obvious. The very first time you activated that camera, changed the password, along with entering the password reset questions.
You should have set the camera to DHCP.
This would have rebooted the camera and if attached to the NVR / Router would have acquired the new DHCP leased IP address.
When you define a static IP address you run the high risk of a IP conflict and taking down the entire internal network.
Best practice is to reserve a IP address tied to the MAC address that is outside of the DHCP pool. Doing so allows all global network changes to propagate downstream without incident.
The use of static IP addressing in a enterprise environment assumes proper book keeping, well defined schema, and consistency in its use and deployment.
Back in the day static addressing was used heavily due in large part because of hardware limitations in being able to properly release / renew said DHCP address.
This caused untold grief to everyone because that end device was in a unknown state of obtaining the new IP address but never - ever did!!
Regardless, the use of static IP addressing should be limited in its use and always placed on a completely different subnet that isn’t related to the main LAN. Following this best practice limits the impact to other networks and systems.