Fandoms by Source Text as you have it proposed which is a page which indexes the various individual Fandom Categories.
Fandoms by Source Community as you have it proposed which is a page which indexes the various broad types of Fandoms that those source texts might be similar to, so that each sub Category is an index of similar types of Fandom Categories.
Then add:
Fandoms by Canon Type which would be a page that indexes the various types or varieties of canon sources (Live Action Television, Film, Sequential Art, Animation, Books, etc.) and each subpage is an index of similar types of Fandom Categories organized in that way.
Result: A fan who likes sequential art can look at that page and see all similar things. A fan who likes Asian-sourced fandoms can look at that page and see similar things. A fan who wants to see the list of Fandoms can go to Fandoms by Source Text and see that.
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Fandoms by Source Text as you have it proposed which is a page which indexes the various individual Fandom Categories.
Fandoms by Source Community as you have it proposed which is a page which indexes the various broad types of Fandoms that those source texts might be similar to, so that each sub Category is an index of similar types of Fandom Categories.
Then add:
Fandoms by Canon Type which would be a page that indexes the various types or varieties of canon sources (Live Action Television, Film, Sequential Art, Animation, Books, etc.) and each subpage is an index of similar types of Fandom Categories organized in that way.
Result: A fan who likes sequential art can look at that page and see all similar things. A fan who likes Asian-sourced fandoms can look at that page and see similar things. A fan who wants to see the list of Fandoms can go to Fandoms by Source Text and see that.