In this particular instance, I don't have many suggestions other than, maybe change the saturation?
To give an example, the rainbow pride flag has always looked muddy to me;

But I recently saw a colorblind friendly version that, to my eyes anyway, looks really good. I can much more easily distinguish the stripes in this one:

I don't know the exact mechanics of how these are different. But maybe there's a lesson here about colorblind friendly stats representation?