Maybe post some more information about your fanfics? If you do, then people who might want to work with you will know what you like to write.
Also, what do you mean by "discuss each other's fanfic"? Do you mean like a beta reader does, where you go over questions and find each other's mistakes? Or do you mean like a support system, where you talk about how the writing goes for each day, what the characters are doing, where the plot is going, things like that?
Once we know that, we'll have a starting point to finding friends.