Try to use color theory application of 50/40/10 rule Primary color 50, secondary 40 and accents 10. Where 50 is main most dark or most light color, 40 is secondary color complementing main one and 10 is accent opposite of main color and his compliment.
Examples: Indigo - blue - light orange; Black - grey - red; White - green - black; Light blue - grey - bordo;
Etc. Hope this helps)
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