What is good "cure" for kidney problems for a type 1 diabetic for 39 years?

BG control: In people with dm and kidney problems, good control of blood sugar is essential. Controlling BP to under 120/80 is also key. Finally, especially if your urine contains detectable protein, medications called ace inhibitors (or related arbs) slow progression to renal failure. Discuss with your pcp or endocrinologist- they should be very familiar with this. Existing damage may not be fully reversible.

No real cure: Although there is nothing great at reversing damage, you need to focus on preventing further damage. Good control of sugars and blood pressure is essential. Medications such as ace inhibitors or arbs are also useful. Drink plenty of water, avoid non-steroidal anti-inflammatories, and keep a close eye on your labs.

Cure is transplant: Prevention of kidney problems includes good blood pressure and diabetes control, and acei. Unfortunately, once significant damage occurs, chronic kidney disease cannot be fixed- we can only help to slow progression, or replace your kidneys via transplant. And if that were the case, perhaps eval for pancreas-kidney transplant.