Check your recipe use: marinades and rubs need less and benefit from blooming in oil; finishing mixes can use a fuller pinch.
Choose the closest substitute from the list (Italian seasoning for convenience; thyme+rosemary for the closest savory core).
Use the provided ratio, then start with ¼ less if your substitute blend is oregano-heavy.
If the substitute tastes muted, bloom it in 1–2 teaspoons of hot oil for 10–20 seconds before mixing into the dish.
Adjust with salt carefully (or add a tiny pinch of sugar if the blend tastes sharp), then taste again.