need your help to track my stolen iPhone 7

Sorry, no one can help you track your device. If you had Find My iPhone turned on, then you can track it once it comes back online. Other than that, there is nothing that can be done on Apple's end or by the users here (this is a user to user technical support forum - Apple is not here).

Here is Apple's support article about what to do:

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Best of luck,

GB