The community is experiencing uncertainty as the days pass; more than a week has gone, and there are now surprisingly few members left.
We only know that a number of parameters, including the standard of the published content, activity, and reputation, are taken into consideration when sending invitations to join, and those of us who were not invited failed in this regard.

There may be a number of reasons why they haven't sent you a message inviting you to join, but the main one is that the content you publish isn't good enough to be accepted. If you publish well even if your reputation isn't great, they will invite you right away.

I believe I must accept that my publications are of poor quality and that my content does not add to bbs; nevertheless, in the event that I am mistaken, I will put some effort into enhancing my content.