Other than consulting a veterinary dermatologist that has examined and done the testing to diagnose your dog. Noone can, nor should they try to give you specific advice as to how to treat your dog.
Also, you may be making matters worse by using OTC medications, supplements, ear drop solutions and such. Not prescribed by an examining veterinarian.
There is effective treatment for environmental allergies but, it tends to be lifelong. Environmental allergies don’t just go away, there is no cure
If you have not had significant results from treatment prescribed by your regular vet and the symptoms have been going on for 1 year/4seasons, I would make an appointment with a specialist.
