@inkican - Agreed - Kbin will live or die based on its content. One thing that should be mentioned to those on the fence about contributing is how powerful Kbin is as a publishing platform in comparison to either Mastodon or Lemmy - this is one of the few places where you can post and get your content on both style of instances.
There are a couple of factors degrading contribution that could be alleviated by more stringent moderation - particularly the bot networks and downvote spammers. I've seen a couple of instances where folks have gotten bullied out of trying to run a forum, and Kbin's flaws in blocking (a blocked user can still downvote your posts and message you), make ongoing harassment an issue for contributors. No one wants to submit something to have it shat upon.
The other factor is that a number of users set up magazines, grabbing popular names from Reddit, then did nothing to maintain them. I think removing or reassigning these ghost magazines to interested moderators would go a long way in improving the content quality here now that the dust has settled from the Reddit collapse.
From a moderator standpoint, if you're looking to expand the reach of your magazine and get new subscribers (and thus, hopefully, more contributors), one thing I've found that helps expand the audience is using a Lemmy account to crosspost, as the cross-posting functionality is built into that architecture and provides a link back to the original. This both expands the range of the content, and draws subscribers from Lemmy that normally wouldn't see you on Kbin to subscribe to your magazine. Mastodon is similar - a single supportive account there boosting magazine content expands your reach dramatically.
Side note: I run @13thFloor and wanted to say if you or your users ever feel like cross-posting our scifi content from there, or cross-posting your content to our magazine, feel free to do so - we fucking love scifi over here.