In need of help on reducing oversupply

Recently diagnosed with Mastitis and am on antibiotics for. I have to pump and dump. I am trying to wean off my supply safely and gently. I heard recently that oversupply can cause mastitis. I exclusively pump due to a bad latch. I want to wean off of breastfeeding entirely. I pump every 3 hours for 15 minutes. Yesterday I was doing 13 ninute sessions after doing sone research. My baby is only 2 weeks old and I am making 6 ounces most sessions. I dont want to cold turkey. But any steps on weaning off this would be helpful. A guide online said to resuce times of sessions slowly every couple days. Is this right?