Hello, I like discourse's achievement system which automatically awards users with points and badges upon completing certain actions. Even just browsing the forum the system awards them.
NodeBB has a plugin similar to this as seen here: https://community.nodebb.org/topic/4397/nodebb-plugin-ns-awards-ns-awards-give-medals
The problem is the plugin is outdated and no longer works on the latest nodeBB.
I think a feature like this is extremely important for user experience and engagement. When people are awarded for something they tend to repeat the behavior so this will help with user retention.