But since you already use bright colors I guess it’s ok. If you go to settings on your phone, find the search bar. Search “White” in it. An option called “Reduce white point” may show up. Click on it. There should be a slide bar somewhere. Slide it to the other side of the bar. Now everything will be slightly darker than before and it helps a lot.
Oh I know a way to stop that eye hurting. Unfortunately it extremely affects the color pallet of your art and I’m not sure how many brands of phone this works with.