Where should I start building the community for a new Stack Exchange site?

Where should I start building the community for a new Stack Exchange site?

Changes have been announced to how Area 51 works in the future. Robert describes how the goal is to bring an existing and active community to Area 51 and start building their new Stack Exchange site, not to start the community building process at Area 51. I left a comment there, but I think the matter is worth more elaboration. If I cant start building the community at Area 51, where and how could I create a community that I could bring there There typically is no pre-existing community. And even if there was, its hard to start building a QA community if we first have to get somehow magically organized before we can come to Area 51 and even propose having a QA site. If nothing else, it would be useful to have some hints or suggestions to start building a community and know whether the SE network wants to be a part of that early stage. For example, I am a Finn and I would much like to see a site for Finnish language currently in definition at Area 51. I am not interested in starting just any online community concerning the Finnish language, but a QA site at SE. Its hard to find followers if I cant show them something they can act on. As I understand from the announcement, this aspect of community building is outside the scope of Area 51. Therefore I brought this up here on the general meta. My point is not to rant but to make clear what I do not understand about the new site building process; I genuinely dont know how the system is supposed to work at the very beginning.

There is always a community for something, somewhere, and if your site proposal is about something so rare and uncommon that only few people know about it, you dont have a chance for such a site to launch anyway. In the past the advise was bring family, friends, post on your social media, etc - this is no longer valid though, based on Roberts post. So what Id do is look for existing community, e.g. even Google, find my way inside that community and become part of it, then ask them to support my proposal on Area 51.

I cannot speak to your example of a Finnish language site, and so I will use one from the GIS Stack Exchange where I participate as an engaged user and moderator. The GIS Tour says that: Geographic Information Systems is a question and answer site for people interested in GIS, Remote Sensing, Photogrammetry, Geodesy and Surveying While the majority of our users are GIS professionals with little interest in Remote Sensing, we have some that span both disciplines, and a large sub-community of Remote Sensing RS professionals. Over the years they have tried to get Area 51 proposals up for a separate site. I could easily envisage them, at some time in the future trying again to secede from us and the way for that to sensibly happen might be for them to ask a Meta GIS SE question like Is it time for Remote Sensing SE to launch, and would you commit to it I imagine that an answer saying Yes, with a hundred votes would be the type of proposal that would meet the new Area 51 criteria.