Don't be a vote connoisseur here please. Redefine how you think about voting and participating.
Do you miss your communities from elsewhere. Well guess what, you are that core community now. If you want it back, the only thing holding you back is you. Don't wait on someone else to start posting. You don't need to worry about the perfect polished quality of your content or if it has been done before elsewhere. The current bar is, umm, poorly defined. No one is judging you. Call it practice. EVERY time you see something interesting, get in the habit of posting it please. Maybe go out of your way to grab a reference or two and post them.
Along these lines, think of how unsure and uncomfortable this may seem to most of us former lurker connoisseurs. You can play hard and thick skinned all you want, but you know exactly what post or comment you posted elsewhere that got the most votes or interaction. Why? Because it matters to you. So upvote everything you can. It matters to someone else too. Don't upvote just for the value or interest you have in the content. Do it just to say "hey, thanks for making the effort to participate and make this place a few lines longer." Please rethink how you handle voting, at least for now, think of a down vote as FU for participating, no votes as I wish you weren't here. We are all likely accustomed to a lot more interaction and validation in our own little niches. This is really an underpinning value of social media, we are here to engage with people, so tell people who are new and unsure about a new and different place, "hey, thanks for participating." You may not know or really appreciate their interests, but you can help us grow a core that can evolve into your favorite niches as the community grows. You are the core community. We can all make it grow if we make it a place people want to be.