You can stop your 1000 calorie diet at any time, if you wish.
There is no guarantee that your beta cells will ever be restored to normal function, especially if you stress them regularly with glucose tolerance tests.
Just because 'reversal' happened to a % of people in the controlled environment of a clinical study does not mean that it will happen to you, repeatedly, after recurring bouts of very low calorie eating - especially after you have added time, weight, blood glucose fluctuations, a continued carb intake, as well as the repeated stress of glucose tolerance tests since your first attempt to reverse your diabetes. You say you are still T2. So each of those stressors has an added impact on your pancreas, which is obviously struggling to cope with the amount of carbs you are currently eating.
From what I have seen when you post the results of your home glucose tolerance tests, the differences between test results are so small they are within the +/- tolerance of your meter. Spreading those tests out by months rather than weeks, or doing the test annually would place far less stress on your body.
The glucose tolerance test is intended to be used in specific medical need, and is no longer supported by the NHS as a diagnostic tool (except in during pregnancy). Repeated home tests, out of personal curiosity, would definitely not be supported by the NHS.
Ed to add the blue text.