Apart of Wordpress, there are several others FOSS and selfhostables

• https://textpattern.com
• https://bearblog.dev
• https://mataroa.blog
• https://listed.to
• https://wagtail.org
• https://github.com/HelloZeroNet/ZeroBlog
• https://zotlabs.org/page/hubzilla/hubzilla-project
• https://writefreely.org
• https://www.classicpress.net

Take also a look, if you want a collaborative platform (FOSS, Online, Cloud hosted, encrypted)

• https://www.system-d.org
• Source https://github.com/HUB-HUmanBeing/SystemD