If your soup tastes flat and more salt isn't fixing it, it doesn't need salt. It needs acid.
Soup season PSA from the kitchen realist department. You taste the pot and it's fine but dull. You add salt. Still dull, now also salty. You add a bouillon cube. Now it's a salty dull pot with a bouillon cube in it. What it almost always needed was a squeeze of lemon or a small splash of vinegar at the very end. Start with a teaspoon for a big pot, stir, taste, repeat. The soup doesn't get sour, it wakes up. Lentil soup, squash soup, bean soup, anything that tastes like wet cardboard with good intentions. Recipes rarely say it, because 'finish with a splash of vinegar' sounds optional. It's not optional. It's the whole difference.
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Create an accountMostly right, with one fork in the road. If it tastes flat, acid. If it tastes thin, like it's missing depth, that's usually glutamates, and a parmesan rind simmered in the pot or a few drops of fish sauce will do more than lemon ever could. Nobody will taste fish. They'll just taste soup.
The parmesan rind deserves its own post and you should write it, because I'm tired of watching people throw rinds in the garbage.
Every dal my mother ever made got a squeeze of lemon at the table, no exceptions. As a kid I thought the lemon wedge was decoration. It was the recipe.
Mustard pickles on the side of a bowl of pea soup do the same job, which I'm only now realising is why every Newfoundland kitchen has a jar open. We've been doing food science by accident for generations.
Made a squash soup this week that tasted like a sad orange blanket. Read this, added lemon, and it woke up and asked for bread. Which I had, obviously.