Highly saturated or high intensity colors (a pure color with no other mixed colors) or highly detailed areas are used to attract attention, and thus give the impression of carrying more weight than less saturated, low intensity areas or visually simpler.
But, don't overdo it - less is better.
With color schemes, it's a good choice to limit your ...
My two cents.
A. Keep the palette monochromatic unless you want some other meaning than "Deep". You could use any color, but normally, a warm color will give you the additional meaning of "Hot", green of nature. Using blue could reference the sea, where darker blue means "deeper".
B. Keep the colors, either light enough or dark ...
All that coloring scheme is distracting and you need to keep people's focus on the content, not the random candy rainbow thing. Reduce the color scheme to a single color, in my example below, 8% of "C" blue, set everything to multiply, and play with something like this.
The graphic needs to support, but not take over, the content.
That, or try a ...
I've got a few suggestions:
It's not just the background that can change colour, you could also change the colour of the text
The background doesn't have to be areas of solid colour, the shapes could be white with a coloured outline or a pale colour with a dark outline, for instance
The background areas could be various tints of the same colour, rather than ...