Comment by frereubu

I don't have accessibility issues, but even so I've been a fan of these settings for a few iOS versions now:

  Settings > Accessibility > Display & Text Size > Reduce Transparency
  Settings > Accessibility > Display & Text Size > Increase Contrast
  Settings > Accessibility > Display & Text Size > Differentiate Without Colour
  Settings > Accessibility > Motion > Reduce Motion
  Settings > Accessibility > Motion > Prefer Cross-Fade Transitions

To try and make my phone less interesting so I spend less time on it, I also use Settings > Accessibility > Display & Text Size > Colour Filters > Greyscale with Intensity turned up to max so it's black and white. If you set Settings > Accessibility > Accessibility Shortcut to Colour Filters you can toggle this with a triple slick of the side button, in case you want to show someone a photo or something.