I have been T2D for some 30+ years now and always oral meds, not insulin. Seven years ago I was maxed out on triple therapy (Metformin, gliclazide, Actos) and I had an HbA1c of 106. My GP referred me to the hospital for insulin training and therapy since I was at the proverbial Progression point.
I decided to try one last throw of the dice, and this site taught me how to do it. I adopted the LCHF way of eating. My blood sugars and weight plummeted, and I have been in the non diabetic range for over 6 years now. I am on minimum dose (Glic 40 mg/day) and still doing a low carb diet of about 130g/day at a guess. The reason why I was maxed out with no effect all those years ago was because I had developed severe insulin resistance, and this was stopping the meds from working. Now my one tablet drops my sugars by up to 4 mmol/l which is where I seem to need it. I am eating toast and potatoes again, and still managing reasonable sugar levels.
If you are finding glic is not working then it is probably due to IR, and you need to adopt diet method to shift the IR. LCHF is one way and the Newcastle diet is another way that seem to work according to the Success stories thread. Medications for diabetes are mostly aimed at increasing pancreas output, which is actually counterproductive to what you need to shift IR