Optimizing.my Nitric intake

42 M, Endurance athlete here that feels benefits from taking Nitric oxide supplements and wondering if there is better ways of raising my levels further or ways to improve.

Assuming the basics that my diet, sleep, and exercise is good and I also dont drink or smoke. I take rhe following.

6 grams of L-citruline 6 grams of beet root powder 5mg daily cialis

Any suggestions on my stack? Is there anything more effective out there to add or change?