I’m not even sure what blogging is, much less microblogging
It’s simple, actually : blogging is posting large content, microblogging is posting short content (hence micro).
That’s why Mastodon is microblogging, for example : because their character limit is 500.
https://writefreely.org/ might be the fediverse blogging platform you’re looking for
It would be, except it doesn’t allow any interaction between authors and readers, making federation almost pointless, it also lacks attachments hosting and other blog stuff.
There’s also Plume, which has slightly more features, but still lacks a lot, isn’t actively developed and is currently suffering from massive spam.
So, to conclude, there currently isn’t any interesting federated blogging platform.
Tell me about it.