the usage of backdrop has not gone up for a year, I saw one conversation today from a developer who said the backdrop hasn't got a large developer community which could be a problem for the future expand, what's the best way to attract more developers here ?
The usage stats don't tell the full story as it depends on the site being setup to check for updates. Some agencies have their own processes for that and disable that module.
That said, we are always looking to attract more. There are plenty of conversations on the chat channel (https://backdrop.zulipchat.com/) if you'd like to contribute.
Currently, we are trying to raise awareness with Drupal 7 site owners