You need to choose a combination of colors to make figures.
The information at the following sites will help you to find the combination suitable for your purpose.
1. Picking a colour scale for scientific graphics
https://betterfigures.org/2015/06/23/picking-a-colour-scale-for-scientific-graphics/
Recommendations for making scientific graphics.
2. colorbrewer2 -color advice for cartography-
https://colorbrewer2.org/#
From "HOW TO USE: MAP DIAGNOSTICS"
This map does not depict actual data. Instead, it has been carefully designed to be a diagnostic tool for evaluating the robustness of individual color schemes. Full use of this tool will benefit your map designs because colors (even very similar colors) are easy to differentiate when they appear in a nicely ordered sequence (such as a legend). The task of differentiating the colors, however, becomes much harder when the patterns on the map are complex, such as in the lower left corner of the diagnostic map.
Through the program at the web site above, you can see how your data would look like when a color palette is used.
I strongly recommend to visit this site when you need to think about color combination.