It is unlikely you will get damages from a person who recommended you go to a private investment group unless he knew the group was far more sophisticated than you had the ability to understand.
And even if he did know they were
far more sophisticated, he merely made a "recommendation".
You made the final decision to join the group.
Hold that thought for a minute though... That is still NOT the reason why you lost money!
You lost money because you, along with the investment group members made the wrong investment decisions!!!