I don't know if I understood, but I think you want to know what makes fanmades cool? it depends. Imo the biggest point of fanmades in any kind of game is to develop a strong community. If I can make fanmades, others can play my stuff, I can play other people's stuff, and if you're that kind of person you can also record yourself beating other people's stuff, make a youtube channel that most people in the community will want to watch, etc. Pro playing is also an interesting field to focus with fanmades. But anyways, to get fanmades you will need fans, which will require a good marketing in your side, and your game to be fun