How come nobody's interested in joining new সংগঠন on this site?

People might not know about the club yet. Others might know about it but might not be interested in its topic, so they don't join. The best bet is to বিজ্ঞাপন the club in related clubs, bringing to people's attention. Members aren't automatically made aware of all new clubs, so unless they're advertised অথবা people look for that subject, they won't find them.

People need to বিজ্ঞাপন their club to get people's interest. And everybody has different interests. আপনি need to have patience.