I think that you should continue doing as you have been doing - starting some projects, joining others, and commenting in others. Start projects for your greatest passions, where you are prepared to be a Project Leader. Join projects that interest you where you believe you can make contributions. Make comments to other projects where you think you can help them or because you just like what they are doing. Above all, decide what you want out of Collaborizm. Are you there to meet new people (network), or to share knowledge, or to advance some of your projects?
You should also focus on establishing your credentials - because that will make you more employable and get you paid more.