I am a 30 year old male. Is a Testosterone Level of 181 low? Should I get treatment?

My reading is 181 (1.81) and .44 free. Doctor is willing to give me monthly testosterone shots. My symptoms concur with people who have low T - fatigue, weak erection and libido, moody, hot easy, not sleeping well. I do, however, weight 270 at 6' 1", and I know that obesity can contribute. The doctor said that 181 for me is "substantially low" and didn't hesitate to give me treatment, but should I pursue a more "holistic" approach (i.e. certain dieting, exercise, etc.) or is that a waste of time? Thanks!