Help me to understand my concern.

Hello Doctor, I need your opinion regarding my condition. I had been suffering from piles/fissure-related symptoms for almost 5–6 years. Finally, on 13 June, I consulted an Ayurvedic surgeon and started treatment. After around 20 days of medicines, I feel much better. Bleeding has stopped, pain is almost gone, and my doctor has stopped most of the medicines. He only advised me to continue the remaining medicines and focus on my diet. However, I am confused about the root cause. I have not been consuming fast food or junk food for the last 4–5 years. I also avoid maida, rarely consume milk or curd, drink around 5 liters of water daily, and regularly eat fruits and fiber-rich foods. So, if my diet has already been good, what could have caused this problem for so many years? Could my sedentary lifestyle, where I spend most of my day sitting or lying down with very little physical activity, be a major contributing factor? Now that I am feeling much better, can I  start gym workout and all.