UPDATE: Given the information uncovered in this answer and the comment discussion underneath it — particularly, the fact the the email we send to committers once the site enters private beta is outdated to reflect older versions of the site lifecycle process and includes information that contradicts our current process — the Community Team is discussing how to proceed and I should be able to provide you some updates on Thursday, March 17th, 2022.
As the Substrate site completes its 5-week private beta, I'm afraid this site is not going to make it.
We had 642 users commit to help build this community before it launched; unfortunately less than one-fourth of them showed up (22.1%). At this point, we generally see at least 150 high-quality questions, which correlates strongly with a healthy launch (that's an absolute minimum), but this subject has not reached that — there are under 150 questions with a score of 2 or more and at least one upvoted answer, and the numbers go drastically down if you look at higher-scoring questions. Looking at the voters page, it appears that most of the voting on the site was done by a handful of people, as opposed to what usually happens on healthy communities, where a lot of users vote for good quality content. At this point, it's evident that this community does not have enough interest or activity to continue.
This site will be closing on Tuesday, March 22nd. The content will be saved, and a link to the archive will be available from the proposal page on Area 51.
These decisions are always difficult and I'm sure disappointing to everyone involved, but I want to thank everyone for their efforts to give this subject the best chance of succeeding.
Take care and good luck!