There isn't a true replacement for Wordpress because of the sheer availability of plugins it has.

But for simple sites like blogs and personal sites Grav CMS is one I've used, and it gives you a web admin panel similar to Wordpress, so the learning curve isn't too bad.

Drupal also gets mentioned a lot as a replacement.

There are also static site generators like Hugo, but those require learning a lot about the specific one you use, and are pretty complex to use, and if you need non-static content like a web form or something it can add a lot of complexity to your whole setup.

I feel like most of the time Hugo and friends are quite enough. They may not be as flexible, but are certainly lighter, more secure, and easier to work with.

https://ghost.org/ is one of them.

I’d say check out this site: https://selfh.st/apps/?tag=Blog

There’s a number on there. I’ve personally used Grav, I hear ghost and Hugo are good. They’re more limited, but they’re much faster and more secure. As someone who had to support Wordpress blogs for years, the amount of security issues on that thing always made me stay far from it for any thing personal.