u/ButterscotchHot8470

Hi, I’ve had my cat Ringo for about 3 months. He has been having sneezing fits and will sneeze up blood tinted snot/boogers and green ones as well. He has been to the vet 3 times and has had two different types of antibiotics and steroids. I also give him lysine support and a homeopathic nose relief liquid. Does anyone have any suggestions of what this might be? If I’m/the vet is missing anything?
(7 months, male, has been neutered, has been diagnosed with a URI twice)