If you have tried all other options with no results then it means your health is not right so you need to adjust your diet and use herbs like
Damiana Leaf
Tongkat Ali
Korean Ginseng
There is a site i found lots of information about herbs for improved sexual health, i cannot copy the content here, but i will provide a link below
Go here to learn about the herbs that can help you last longer in bed and give you harder erections. Source