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

Een open-source headless CMS
★ 33.3K CMS Database Data License: BSL
Directus is een real-time API en App dashboard voor het beheren van SQL database-inhoud.
So is Ghost

Headless CMS for professional publishing
★ 51K 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.