Recommendations for a Writing Sub

Hey all!

I've been investigating ways to grow my subreddit, r/OtherworldArchives, and have hit a bit of a roadblock. The sub is built around posting serialized content, meaning chapters for longer web series and the like, inspired by r/HFY.

Most places recommend posting daily/multiple times a day to build engagement, but the problem is that the sub isn't quite constructed to allow that with only myself and a couple other people posting in it currently, given how long it takes to write and edit a decent piece of fiction.

So, the question is relatively simple, while I doubt the answers will follow suit. Any recommendations on growing a sub that will have limited content until it has a following?