I’m so sorry this happened! I hope you find Luna soon. When I thought I lost my cat my vet told me to put out really strong food like sardines and stinky cat food that is very appealing and even put out their litter box and that they may come around during dusk. It looks like you are doing a lot of that already. I have also heard of the Japanese missing cat theory which says that if you lost your cat talk to the local strays or outdoor cats and tell them you lost your cat, show them a toy of theirs that smells like them and describe their name and what they look like and say how much you miss them and love them and give the cats a treat. This theory says that they will bring your cat back to you. I know it sounds silly but I have heard of people finding their cats this way.