There seems to be a lot of microblogging going around, but I want a place to put my writings that are much bigger. I know that having my own website is also an option, but I’m finding filtering ethical hosting providers and website builders to be a lot more difficult than I thought it would be, and I’m afraid that even if I find them, it’s going to be too expensive.
Fediverse Report writes in today’s edition that the NodeBB, WordPress ActivityPub plugin, WriteFreely and Ghost developers “recognise themselves as the ‘longform’ people.”
Not counting WordPress, that I really (really!!!) dislike (just because; your mileage may vary), I would say that Writefreely is the closest to traditional blog platform with activitypub baked in.
You can try it on https://writefreely.org/instances
Have a look for Friendica or Hubzilla.
I’m guessing Friendica isn’t big enough for what you’re looking for?
Mbin supports access to mastodon with very basic functionality