How to get vegan cheese to taste like cheese
According to Eater, the latest and most sophisticated vegan cheeses involve fermentation of the cheese base itself, rather than by adding any particular ingredient:

The process for making fermented vegan cheese, which is most nut-based cheese, is quite similar to that used to make dairy cheese. A nut is soaked and then blended with water to create a milk base, to which a culture is added.

As such, if you're making your own, then you need to look into how to ferment your own nut milks and other ingredients.