What can I try at home to treat kidney cancer?

See your doctor. Kidney cancer is a potentially fatal illness that needs to be treated by trained specialists. They will "stage" the cancer before recommending appropriate treatment. There are no effective home treatments.
Nothing, Sorry. There is no known home treatment fro kidney cancer. See a specialist in this area. If untreated, kidney cancer can be lethal.
No approved home tx. Kidney cancer is primarily treated with surgery if the cancer is confined to the kidney. Depending on the size/location of the tumor, partial removal (called partial nephrectomy) of just the tumor portion of the kidney is recommended. The majority is treated minimally invasive techniques including laparoscopic/robotic-assisted surgery. Cancer spread from kidney may be treated with chemotherapy.