Acid And Fat Are Almost Always The Missing Elements
When a dish tastes correct but dull, the answer is usually one of two things.
There is a particular kind of failure where nothing is wrong. The vegetables are cooked, the seasoning is present, and yet the whole thing sits flat on the tongue and nobody goes back for more. Nine times out of ten the fix is a squeeze of something sour or a spoon of something fatty, added at the end. Acid lifts. It makes sweetness read as sweetness rather than as heaviness, and it gives the palate an edge to catch on. Fat carries. Many of the flavour compounds in vegetables and aromatics dissolve in fat, not water, so without it they never fully arrive.
Get in the habit of testing for both before you change anything else. Take a spoonful of the dish, squeeze a little lemon or vinegar over it, and taste. Take another spoonful and stir in a little oil, butter or yoghurt, and taste that. One of them will usually make you sit up. Then apply the winner to the whole dish, gradually, tasting as you go, rather than committing in one pour. This little two spoon test costs nothing and teaches you more about your own palate than reading ever will.
Timing matters as well as quantity. Acid added early and cooked for a long stretch loses its brightness and becomes background: useful for depth, useless for lift. Acid added at the last moment stays sharp and perfumed, particularly if it comes from citrus zest or a fresh herb with sourness in it. Fat behaves the reverse way. Fat added at the start does the work of cooking and carrying aromatics. Fat added at the end coats the palate and makes everything taste richer. Most good dishes use both twice.