I think going through the gummi missions as fast as possible is fun.

Be the change you want to see in the world. Every category exists as soon as you run it.

but then where do i put it?

You can choose to run a category just because you find it fun, even if it doesn't have leaderboards. If it's competition you want, you'll have to convince others that it's fun. You could talk about it or show it off on discord, but I don't remember anyone else expressing interest in running gummis so I don't feel very optimistic that you will find competition.

thank you!