(Help) How Can I Achieve That Retro Look?

Hi fellas, I’ve been doing research for a while to do that PS1 retro graphic style look.
But there are only basic tips for starters. (Low resolution, low polygons etc…)

So I’m not looking for “wobbly” vertex effect anymore.
I just want to know how can I do that Unity PSX Shader Shadow/Lighting effect “Color Precision” on Blender.

I made a few attempts with “ShadertoRGB” but the results are not looks what I want.

The tutorials for the compositor from here might give you an idea.