I like putting my phone on black and white but sometimes you do need to know what color things are… my solution is I turned the saturation 95% down - this way my phone is not so stimulating to look at but I still can make out the color of things … and I think it is making my color perception heightened as a bonus
having your phone be black and white makes every app 10x less addictive. i turn my phone on & off black and white depending on what i’m doing and there’s an easy way to switch back and forth in settings by triple clicking the side button: accessibility > general > accessibility shortcut > color filters and then you can go to color filters (just search it) and choose grayscale. i set mine at ~90% intensity so i can still see a hint of color. i love looking up from my phone and thinking “wow, the world is so colorful”