2019.4.31f1 Can't get the Shader Graph to work

Hi so I am trying to make a Vtuber model and I really want to get a space shader on the main character, but every solution I have tried causes either my file to break or does nothing. I have all of the appropriate packages installed. I can’t use a more recent version of unity or else the other packages I need to use to create the VRM are incompatible.
I just need to be able to create a shader graph and then I’ll be set but the option is unavailable and just allows me to create .SHADER files. changing the extension breaks the shader and makes it unusable, changing the graphics to any other pipeline breaks all of my other shaders.

All I want to do is make a shader graph, any help would be greatly appreciated.