Sometimes the flavor I add to a dish doesn't "transfer" to it. Why does it happen, and do I work on it?

I've made fresh tomato sauce today and added both crushed fresh oregano leaves and crushed dried oregano leaves (that I dried myself). But the sauce was having NONE of it and picked almost no oregano flavor. My family and friends think highly of my cooking, and i'd like to think I know how to cook. But when that happens I little recourse besides adding more and watching what happens. Many times I failed to transfer a given flavor of a spice or a herb in spite of adding TONS of it and i'd like to work on this weak point. submitted by /u/BigBootyBear