Quick wins help establish momentum.
Quick wins show the audience that the community can make a difference.
A problem with most non-profit communities is they go for difficult, huge, victories instead of simple quick wins.
A quick win can be easy. Creating a community constitution can be a quick win. Let members say what they believe the community should stand for, what the community believes in and publish the summary document.
A quick win can be a live discussion with an expert speaker. Members ask questions. You record/transcribe the discussion and publish it.
A quick win can be helping one member achieve something. Perhaps get a job, get support, resolve a technical problem they have (using the collective efforts of the community).
A quick win might be taking a stand on an issue and getting a community statement in a newsletter/trade press.
Anything that your community can collectively achieve can be a quick win. If your community is just getting started, identify a few you can work on. If your community is stalling, you might need a few more quick wins.