Maybe write freely would be an option? There is also a hosted version of it on write.as. It also speaks Activity Pub so it would be published on the fediverse too. I’ve not looked super deeply into the technology, but considered using it for my (future) blog.

But going with a self-hosted approach like Towonel, you need a server with a public IP too. And I think what the commenter meant is, if you already have that, you can just setup a WireGuard connection to that public server, so that it can route the traffic to your local network.

At least write your comments by hand, please :(