Is there a way to make the game slightly more colorful? I don’t have an Nvidia card so I can’t use their software. And I can’t seem to find a clear answer if reshade is against TOS or not.
You should probably ask this in the tech support forum. You don’t need a paid sub to post there.
Every forum I’ve posted it in I haven’t really gotten an answer. 
In the past, I used gamma settings to go between a washed out bright display to a darker display with deeper colors.
The Addon AdvancedInterfaceOptions may have some graphical settings.
It’s mostly game options that no longer have a graphical interface and some that have never had an interface.interface