Cats often hide close by. Check with all your neighbors, around the block & across the street. Knock on doors, and/or distribute notes or fliers with picture & contact info (I printed them 4 to a page, cut up & taped them to front doors). Last year my old cat went missing for 10 days; turns out she was trapped in a neighbor’s garage only two doors away! Your pet is very likely nearby. You may even try putting the litter box outside, so your cat can smell it. Also, keep checking with nearby vets, and your local shelters (I left or emailed picture-fliers there too). Best of luck.