Hi,
since I'm in here, and this is now over 6 years, I've seen a lot of people coming and going. Had a discussion today on facebook, with a guy that was in here, but is no longer active, but floods my facebook wall with posts.
I asked him why not coming back and post there. His response was that sometimes it is too complicated and risky.
Well, now there is keychain, so no keys are needed, because he was active in 2018. Risky he said, if the price drops. Well, if you post on facebook you don't get anything in the end, so no risk in there, just the loss of time, which might be riskier than everything else.
The long debate since I'm here, is the user acquisition, but I think much more important the user retention. Keep the people here. I've seen a tweet by 
Is this a good number? Relatively, as there are users with multiple accounts. I would say, we had less than 100k active unique users the past year. 100k is still a very low number for the internet. If we manage to reactivate at least half of the unique users that left, the numbers will skyrocket.
What to do? First interact with as many as possible, make them feel welcome. If people feel good in an environment, they will stay. I almost quit 3 years ago, due to some issues, but, and there is a big but, as 
It is up to us, to make people stay. If they stay, more people will join, as a chain reaction. That is it in my view.
How do you see it?
