I would like to learn C#, but I learn best by having a thing I want to make and figuring out how to build it (like teaching myself CSS to make the Daily G'raha archive), but I can't think of something I'd want to build in C#

I know it can be used to make Unity do stuff but I don't think I also want to learn how to use Unity

I made a rpg in C#! ... it was all text, you might want better motivation than a text-based rpg, but it was fun.