This will be the next phase.As far as I know, there is no way to transfer members from the old group to a new group. The only way is to notify the old group that you have just created a new group and hope they will also join the new group, of course with the group. You need to regularly post as well as share experiences and knowledge necessary to attract users to join and stay.
For the moment, I'm cleaning up the group I bought.
Facebook has temporarily blocked my ability to delete posts, so I'll have to wait a bit.
It's more or less plannedYou could post a message explaining the situation and inviting members to join your new 'dissident' group if they are interested in following your moderation policy.