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One other thing that is very useful for minimalisms (and vectoring in general) is swatches. They are colors you pick and apply to objects from a toolbar rather than droplet it off another object.
If you decide you want the color to be a bit different, all you need to do is select one such object and all objects with the same swarch will change, since you are changing the swatch color, not only the objects.
This way you won't accidentally forget a small object or overflood your vector with too many colors.