We're going to decide on it soon. To participate, join the Discord server (note: you'll need to create an account):
Request a channel for you to post the definition of your OCF. There, you can slowly build up to higher cardinals, and once you've reached at least weakly compact level, your OCF will be included in the voting.
I'll post definitions with examples and explanations in another blog post (or blog posts) when we've decided on an OCF.