I feel this. I've made attempts to generate discussion by making posts, utilizing microblogging to engage with those on Mastodon, and laid down structure for a magazine and I've seen some steady growth. However, engagement is sparse. At times it feels like I'm talking to myself. There's probably things I could be doing better to foster a healthier community. That said, I understand the gripes OP has, and believe this will be remedied over time thanks to the existence of federation.
edit: These upcoming changes might help ease your mind, @DarkGamer https://kbin.social/m/kbinMeta/p/1002621/Hi-in-this-and-probably-the-next-week-I-will
As long as you make it clear that the magazine you're moderating is for your own posts, I don't see any problem with restricting content to your own. If anyone has a problem with it, they can make their own magazine. ¯\_(ツ)_/¯