Soup – Curried parsnip soup, not flavoursome enough

Add more curry powder, or whatever you were using. If it's a powder, it won't need to cook much longer to take up the flavor. If it's a paste or liquid you can just stir it in.

If it's something bigger and you can't grind it, you'd need to cook a while longer to get the flavor out. If you also don't want to cook the soup much longer (if perhaps it has chunks that you don't want to overcook), you could take out a bit of liquid to cook the spices in then add it back in.

It's also possible you've undersalted it, or could use some more richness from stock (or bouillon cubes/paste, but be careful not to oversalt).