66% is borderline and could result in problems with the connection. I would try a closer source. You do not need to delete and reinstall the camera, but you would need to update its wifi settings if the extender uses a different SSID/password.
If you set up a distinct SSID for it, you can use AP or WPS mode to connect the cam to the new network. A guide is linked below. It may be best to use a unique SSID as it will disallow the camera from ever trying to connect to a more distant source.