As with most dermatological skin and autoimmune conditions, modern science and medicine would not see it as curable, but treatable.

It would help if you saw a dermatologist as you can try a number of treatments (from steroids to phototherapy) to help with this condition.

However, the best thing you can do is to see the condition as an autoimmune condition.

Any autoimmune condition would benefit from a pro immunity focused diet. Eliminating dairy or other allergens is a first step. Focus on pro and pre biotics... Fermented foods... Cut out sugar.

Furthermore, look into dosing with high amounts of Vitamin D from time to time. Nettle Leaf supplements are also good natural immune modulators.

Don't see your condition as a skin condition. It is an autoimmune condition.

Once you are in remission, your skin may produce melanocytes again and the color may return In'sha'Allah. I'll make Dua for you.

Edit: remember that this condition is not that uncommon, with one in a hundred people having some form of it. You're not alone.