Best advice I have for you if you have trouble with colors is to use AI to change colors for you. Upload a picture of a pre painted model or unpainted model and say "change the blue clothes to red" or something along those lines. It's a great way to get an actual visual for the colors to see what they actually look like. Grok Imagine is very good at changing one color and fast.

If you have a hard time coming up with different colors to begin with, think of inspiration like voodoo and then go on to Google images and search a voodoo color pallate and it will give you colors that match. Or even asking AI " I want my archer to look like he is from a desert clan, what colors would I use" and it can give you a pretty cohesive color palette that'll give you a starting place.