If you want to self-host it on a server, WriteFreely is as lean text focused platform. Lightweight and pretty easy to spin up and has some basic federation abilities.

If you're a bit more adventurous, I have a soft spot for Plume it is still under development so can be a little more work to get running, but it does have the ability to host images with a built in media manager and more federation interactivity between instances of Plume and also the rest of the fediverse.

If you're on a web host, can't go wrong with WordPress just make sure to use the cache plugins to make sure it is a bit less sluggish.