Nutmeg is a criminally underutilized spice, and a little goes a long way. Damn-near everything I cook gets a little bit of nutmeg.
If what you’re cooking tastes like it’s missing something but you can’t quite put your finger on what it is, in my experience most of the time it’s acid. My go-to way to add that is with a good squirt of yellow mustard.
A little bit of cocoa powder finds its way into a lot of darker colored savory dishes like stews and such