Just another option. If you know already or are willing to learn how to write documents in markdown format (like how lemmy supports), and learn some of infrastructure set-up and it can be between free and very cheap to have a blog on something like netlify.app, github pages or others. There are plenty of static site generators out there that can be both relatively easy and very powerful.

I currently have a private blog set up on a cloud provider that just takes markdown documents and builds those along with some templates and webpage code to create a site like this. Although I have mine hosted on a VPS with my own domain, it's completely possible to use something like github pages, netlify.app, etc. for that. They're both free afaik to host on, but if you want to pay for a dedicated service they are usually between 2 and 5 USD per month.

Edit: The option above isn't activitypub software, sorry for not realizing that immediately, but it is federated in a way I suppose.