Sure, WordPress is awesome.

But have you considered these open source alternatives?

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

Check by yourself: Directus , Ghost .

So is Directus

Un CMS headless open-source
★ 32.5K CMS Database Data License: BSL
Directus è un'API in tempo reale e dashboard dell'applicazione per gestire contenuti di database SQL.
So is Ghost

Headless CMS for professional publishing
★ 50.7K 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.