Dana :)
Splash of soy sauce or fish sauce - not enough to be noticeable or change color. Even in weird things (soy sauce with creamy things or fish sauce with tomato things). Instant depth and umami! Also, saving rinds of Parmesan cheese in the freezer and adding them to any soupy related thing. I also got this dried tomato powder from a spice brand (Burlap and Barrel) which adds depth to anything! I like to look for things with natural umami (glutamates) - fermented things (miso, soy sauce), mushrooms, tomatoes, preserved fish (fish sauce, anchovies)