Diagnosed with type 2 diabetes reduced A1C blood test without using Metformin and Lisinopril?

I was diagnosed with type 2 diabetes at the beginning of last year. A1C was 7.0. I was prescribed Metformin and Lisinopril. Since then, thru diet and exercise, I lost 20 lbs. and reduced my A1C to 5.5 and staying at those levels… without taking ANY of those drugs. My blood pressure is and always has been perfect. I’m 60 yrs. old, 5 ft. 6 in., and 175 lbs. My question is, is there any need to be taking these drugs if I am maintaining normal numbers without?