I agree. The simplest designs are the most visually appealing ones. I can honestly say that using a website that has better accessibility is nicer than one that is "pretty". Is there a way for you to print out your designs on a 3D medium so you can feel them? The spacing is way more important to the appeal than color.
>I don't even know where to begin with that
There are color swatches you can use and the correct colorization can be determined mathematically. Check out some of Google's guideliness at https://material.google.com/style/color.html#color-color-pal...
I skipped past a big swatch list because I think it could be annoying in a screen reader.
I implore you to keep designing websites. The fact is that designers focus way too much on the benign aspects of design and not enough on the ease of use and the mathematics that make them look good. If you focus on those aspects, you can make a great design.