Any advice on the best way to detox following heavy metal poisoning?

Lead poisoning: If you have mild to moderate lead poisoning (20-44 mcg/dL), you may not be given medication. Doctors will work with social workers and public health officials to eliminate all contact with lead in your home, workplace, and school. They then carefully monitor blood levels until the lead has naturally worked its way out of your system. Medications If you have moderate lead poisoning (in some cases) or severe lead poisoning (45-69 mcg/dL), you will need medication to supplement the environmental controls. Medications may include oral or intravenous chelating agents that bind to lead and speed its removal from your body in your urine. Blood levels above 70 mcg/dL are considered acute cases. Hospitalization and emergency medical treatment are necessary.

Caveat emptor: You already have lupus and this is difficult enough. There are fringe practitioners and crooked labs that will tell everybody that they have "heavy metal poisoning" and offer a variety of dubious treatments. Sorting out how much of this is real has been a challenge for scientific medicine and there are some unknowns. Do be careful.