To indicate a button on an interface that switches to dark mode or to light mode, it's common to have a couple of sun/moon icons:
🌞 for light mode 🌙 for dark mode
But at least part of my brain is saying "Click the Sun icon if your screen is too bright", and I have to work out whether the moon is only visible during the night, and so "do I want the screen to be brighter because it's darker or ... ".
Well, perhaps my brain is a bit perverse - but are there better options for indicating a dark/light mode switch?