I second Ghost for that use case, I'm using it for years already for my personal blog (not very active: https://blog.notmyhostna.me) and it's getting better all the time without getting bloated so far. I never really got started with static site generators as it's just too much overhead for me.

If you don't want to self host it and be even closer to the hands off approach of Medium you can just buy the hosted version.