Please follow the Community Question Guidelines by posting your automation’s YAML configuration… it makes it a lot easier for us to spot any possible issues that may be hard to spot in a screenshot of the UI Automation Editor or to glean from a written description.
From what I can tell from comments about the Govee H5121 Motion Sensor, it seems to only offer motion detector with a 1 minute cool-down. That would explain why you have an event entity instead of the more common binary_sensor entity. The device itself does not seem to support "when no motion is detected". So, your option would be to basically do the same trigger as your "turn on" automation, but with a duration... basically assuming that if the event entity's timestamp doesn't change, then it must mean no one is moving.