More dietary cholesterol. Raw egg yolks (easier to consume raw) in as large a quantity as you can handle.
Nutrition Facts has a page about testosterone, I'd suggest you start there: https://nutritionfacts.org/2017/05/16/foods-that-affect-test...
edit: link to a video about ED vs diet: https://youtu.be/OVXzT_RBxFk
Eat those yolks, folks.