If your goal is to make yourself more valuable to employers/clients the best path is to specialize in some critical and niche enterprise tech. People that are good at stuff businesses were lured into using get paid very well. In my case it was SharePoint, but that’s just an example.
Knowing your way around the OS is taken for granted in these positions, so you have one piece of the puzzle, which is great, but you need the other pieces.
But be careful, if I have to choose between two experts, one with basic win+linux and the other only linux, I’m choosing the former.