Grayscale is Harris' easiest piece of advice. And the best time to experiment with grayscale is during the holidays. Compared to the colors of your phone screen--notice how the Xmas lights that use to delight, now seem drab. Try an experiment of turning on grayscale for a while-- and notice how the Xmas lights regain some of their magic and eye-candy.

https://briandeines.medium.com/where-to-find-the-christmas-joy-button-on-your-phone-2754694ad166