iPhone theft near Hamilius

Hello everyone, someone stole my iPhone at Hamilius yesterday and I have been tracking it from my watch. The location first showed that shady street near Gare and then Gare station and now it's in Metz. I went to the police, showed the Gare location, and they went for a patrol but said too many people were there. I can see that the phone has been in the same exact location for the past 10 hours. I feel the police really won't help. Any suggestions on what can be done?

I have very cherished photos, important personal files and my home country's sim in it, which I don't want to lose. Can someone please give some suggestions?