I've certainly drawn hope and purpose from my efforts to achieve remission, and I wish you the very best of luck. From everything I've read there are three pillars to achieving remission - weight loss, diet, and exercise. Almost every account I've read of people achieving remission has involved at least two of the three.
Weight loss - According to Prof. Roy Taylor a person should aim to lose at least 15Kg (around 2.5 stone) or 15% of their body weight, whichever is the smaller number. Any weight loss may help but according to Taylor this is a reasonable target to aim for in order to empty your liver of fat and prevent it from re-accumulating. Reducing liver fat may reduce insulin resistance in that organ and lead in time to reduced fat in the pancreas, which may improve levels of insulin secretion.
Diet - Lowering how much carbohydrate you eat will reduce your blood glucose levels in the hours after eating. To illustrate the point I've attached two modified screenshots from my own CGM, which I've been experimenting with. The first shows the effect of eating a relatively low-carb breakfast (an omelette with yellow peppers and tomatoes followed by a small orange) and the second shows the effect of eating a higher-carb dinner (chicken stir fry with white rice). You can see that there is a big difference in how high my blood glucose levels got after eating.
Exercise - Working your muscles improves their insulin sensitivity and causes them to sponge up more glucose from the bloodstream. Exercise at any time of day helps, but the third screenshot illustrates the significant effect of moderate exercise beginning about 30 minutes after eating. I had Asian food delivered, which I ordered with brown rice. The rice portion is generous and usually I wouldn't eat it all, but as an experiment I ate the lot, waited for digestion to get well underway, and went for a 3 mile brisk walk. The idea was to be moving during the time my blood glucose levels should be peaking after the meal. The meal was high in carbs, equivalent to more than three slices of bread, but you can see that exercise actually reduced my blood glucose levels at a time when they would otherwise be getting very high. If you can incorporate exercise into your daily routine then this will likely reduce your average blood glucose levels and your HbA1c.
Do keep in mind that if you switch to a low-carb diet while on gliclazide you may need the dose reduced or even stopped depending on how low you go with carbohydrate intake, in order to prevent hypos. Experiment with care, and the very best of luck!