Your fasting blood sugar of 210 mg/dL is high, indicating your current combination of teneligliptin and metformin needs adjustment. It is very common for diabetes management to require treatment updates over time, so there is no need to panic. Your doctor may consider optimising your metformin dose or adding other generic medications like glimepiride or dapagliflozin to improve control. Your vitamin B-complex supplement is excellent for supporting nerve health. Please consult your physician to safely adjust your prescription, and consider getting an HbA1c test to assess your long-term control. Meanwhile, continue with a balanced, low-carb diet and regular daily walking.