Did pretty much the same thing. Engineering team was busy and took them a little over 7 months to deploy a WP Headless Blog. In this time I wrote 1000 articles 2.5 word-long each (on average).

Mid-July I published them all in one go and traffic just exploded. Went from 2.5 organic visits per month to 100K visits per month in just 4 months. No backlinking campaigns whatsoever, until just this week.

We are about to release another 80 articles by Mid December 🙂