If it is not charged then you will have to resort to simply looking for it, unless it is still in its last location before running out of charge.
Read this support article to find out how to use the Find My app to locate a missing device or item. Click here --> Find your lost Apple device or AirTag with Find My - Apple Support
- A person can use the Find My app on a device owned by someone in their Family Sharing group.
- Alternatively, anybody can sign into https://www.icloud.com/find to locate their device using a browser. You don't need a two-factor code if you use any internet browser and log into www.icloud.com/find
Note that the address must include the "/find" as shown above.
The chances of locating a device depend upon which features you selected in:
Set up Find My on your iPhone, Mac, and other devices - Set up Find My on your iPhone, iPad, or Mac - Apple Support If you are in your house and trying to find a phone there then standard GPS won't help much. For me with GPS alone I am lucky if it can even get it to our house property, much less a particular place.
If Find My is offline or not working - Apple Support
If you see "Offline," "No location available," or "Location Services Off," your device might be offline for one of these reasons:
It's powered off, the battery has run out, or more than 24 hours passed since the last location was sent to Apple (if Send Last Location is turned on). When your device is connected to the Internet, you can see the remaining battery in the upper-right corner of the information pane.