Sure, WordPress is awesome.

But have you considered these open source alternatives?

They are free, self-hostable and community-driven.

Check by yourself: Ghost , Directus .

So is Ghost

Headless CMS for professional publishing
★ 55K CMS Blog License: MIT
Ghost is the most popular open sourcem headless Node.js CMS which already works with all the tools you know and love.

Read more about Ghost
So is Directus

An open-source headless CMS
★ 37.5K CMS Database Data License: BSL
Directus is a real-time API and App dashboard for managing SQL database content.

Read more about Directus