I lost my cat in a large field.

My cat is 5 years old, a tabby, but a house cat. We brought her to our summer house, and he opened the screen door wire and escaped by hisself

I put his food, litter box, everything in the garden, and even though I searched for him for hours all the way to the street, I couldn't find him.

He's been missing for 3 hours and I can't find him. What should I do?