There is no cure for IgA nephropathy in the USA or anywhere in the world. I suggest that you consult with a nephrologist in your country and ask for advice. IgA nephropathy has many different symptoms and has many different manifestations in individuals around the world. I am not able to provide treatment advice without performing a complete history and physical examination. I am an advocate for the DASH diet. You can follow a DASH diet as long as your kidney function (estimated glomerular filtration rate or eGFR) is great than 30 milliliters per minute per 1.73 meters squared. You can review the DASH diet at: https://www.nhlbi.nih.gov/health/health-topics/topics/dash
I do not recommend immunotherapy for IgA nephropathy.
It is best to seek the advice of a nephrologist in your country.