I am having problems with erection and sexual interest. Please help.

Hello doctor,

My age is 40. Currently, I am having less erection when trying to have sex. Sometimes, not able to get an erection at all. It is a very embarrassing situation. I am married for the last 11 years. We were having great sex before our marriage. After marriage and with our kid, sex has become boring. Now when I am trying to have sex, I am not getting enough erection. Sometimes, it is zero. In between, I tried Manforce 50 and after that DT Manforce 100. Sometimes, it works and sometimes not. I do not have diabetes or hypertension. I do not have any bad habits. I do not smoke and I drink once in six months. My doctor has advised me to take Nano Leo capsules twice daily after food and tablet Duroplus twice a week 30 minutes before sex and go for sex after two hours. I am taking these pills for last 25 days. Duroplus I had only taken twice. My problem is previously my erection was less but when erected, it used to last long. Now I am getting erection immediately and it is hard erection but not able to maintain it.

Now I am able to get my morning eraction sometimes. I have checked my testosterone level. It is 501. Please suggest medication and let me know whether I need to stop Nano Leo tabelt or not which I am taking right now. I am doing some regular workout 45 minutes to 1 hour per day. Eating healthy diets, avidoing junk food, spicy food. Taking almonds, wall nuts, lemon, honey, banana, resins, cummins, ginger, onion, garlic, pomegranate, apple, carrort, spinach in more quantity in my food. What else life style modifaication and diet I can follow? Please advise accordingly.