Email the last five people that joined your community.
Ask how they heard about your community.
If they came via search, what terms did they search for?
If they came via a referral, who referred them and why did they trust this person?
If they came via your website, what information were they looking for?
What drove them to sign up and create their first contribution?
Why didn’t they just read?
Was there anything that nearly stopped them from signing up?
What parts of the community mattered most to them? Was there anything they didn’t care about?
It only takes 30 minutes and you might be amazed by the quality of data it yields.