Wafrn might be worth a look. I've been meaning to try it myself.
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Most microblogging platforms actually don't artificially limit the amount you can write, unlike Mastodon, so they can also work for macro-blogging.
Mastodon's character limit is pretty easy to change when self-hosting, but it has other limitations like a lack of even basic formatting and images inline in posts. I think that's true of several of the others as well.
I changed it by using GTS instead
Ghost might fit your needs.
Ok...but this looks way too enterprise?
It's a non profit and open source. But they do the same as WF, basically just an account that posts links to your blog.
Molly White does a better job at explaining what Ghost is than I could. She did so on Ed Zitron's podcast, Better Offline a little while back. Sorry, but other than that I'd just do some more research.
Here is said episode.