Put flyers on doors of your neighbors and telephone poles. Not just next door and across the street but a radius around your house maybe a couple streets over. Put info, on the Flyers including asking them to look in their sheds under their sheds under their decks or in any place that a cat might get trapped on their property. Talk to your neighbors. STAY SAFE!!
You can ask businesses near you to put a sign up or put one by their register. Usually they're very helpful.
Check with the Humane Society and other rescues. Also check websites for more kitties.
Check with veterinary offices to see if anyone has brought in a kitty that looks like yours.
A Humane trap is very helpful. It took a friend 2 weeks with a trap but she finally got her cat. I'm praying you find kitty!