Yet another collaborative worldbuilding project. Mistakes to avoid?

cross-posted from: https://lemmy.ml/post/3035737

I'm making a github organization that uses GitConsensus to manage a collaborative markdown worldbuilding wiki. Basically, you'd vote on pull requests using thumbs up and down emojis.

I don't want this to be a thing where I point at an empty text document and say "worldbuild." What's some work I could do beforehand that could get people interested in contributing?