A few things come to mind.
1. Put up some referrals to places like chaturbate.com, using a fake account pretending to be the girl posting it, make her an admin as well so it looks legitimate and makes her stand out.
2. Other adult marketing related stuff, go look at what some of the other groups like yours are doing and copy any trends you see.
3. Sell it, no idea what it is worth, depends on a lot of factors.
Where l can sell my group?
What is the interaction rate of your fans with posts that you make?
Most groups are monetizing by putting a pinned post at the top with a sponsor. That sponsor will pay $$$ to be there.
I know DIY and hobby groups where tool and parts stores are pinned at the top.
What mean DIY groups and where to find a sponsor?
you can make a lot of money like 100$ each day by your group contact me if you are interested skype : khalidismailI have "sexy girls" group with 80k members. How l can to make money with my group? Please let me know. Thanks
you can make a lot of money like 100$ each day by your group contact me if you are interested skype : khalidismail
Why do people insist on making posts like this. Always with the 'pst, hey, I know a way you can make a load of money, Skype me if you're interested'. What, are you some Nigerian Prince?
This is a forum, why not just post the information you know so others can benefit from it rather than pulling someone in to a one-to-one private chat. It always smells fishy.
If you can help this member out then post what you know instead of sounding like some dodgy scammer.