You can make Nim ecosystem Better if You are interested,
You can start by Porting useful libs and other important things missing in the Ecosystem
If U have compiler and Programming language design knowledge You can help Araq and other with that but no one knows Nim more than its designer so it can be hard to contribute except if You really have a lot of experience.
I think You can start by making a complete Game framework for Nim if You are experienced in it (Game dev) ?
Or else You can make general purpose libs that are not available. Well there is a lot of scope but it depends on what You know and in which You are interested.