iPhone 6s lost in 4 december 2023 in the night

My question is, in case someone has found my iPhone, can it still be track to find if i give my serial number of the phone ?

No. It is not possible to track the location of a phone when it is Offline using Apple's Find My app.

The phone is Offline for any of these reasons, or a combination of these reasons:

1) The battery has run down

2) The phone was powered off and is not near any other Apple device

3) The phone does not have an Internet connection where it is currently located

In addition, thieves are very fond of placing a stolen phone in a special type of bag that will not allow the phone to send or receive any signals.....even if the phone is powered on.

I'm sorry, but if the phone has been Offline for a month, the chances of ever locating the phone are just about zero.

You need come sort of cellular or wifi connection to be able to upload it's current location to Find My.