I reduced my blood glucose to normal levels (it's now in the 36-38 range on HbA1c) through a keto diet (which I'm still on). That means around 20g carbs/day, equivalent of one apple. No bread, pasta, flour-based items. sugar, root veg, fruit, rice, etc. I didn't and don't follow a "diet plan" - I just don't consume carbs in any quantity. Every 4-6 weeks I may have a slightly relaxed meal which would be "low-carb" rather than keto and therefore has a lot more carbs than I normally take in. Testing shows that after a meal like that my BGs elevate and stay elevated longer than I would like.
For me "reversal" would imply I was no longer diabetic, which I don't think is the case or ever will be the case. I prefer to say I'm in remission, by which I mean that my blood glucose is low enough not to cause further damage and symptoms. I had enough unpleasant symptoms long before my BGs reached the "official" diagnostic level so I need to make sure I keep my levels where they are now.