Like pumping up a bike tyre, you need to build pressure. You need a point where the messages you send out hit a wall and start bouncing back. You can’t do that if you target everybody.
Target single groups at a time, not the mass audience.
Segment the total audience you want into the smallest groups possible. Perhaps just 50 to 100 people. Invite them to join, cater to them and find a representative to continue growing the group.
Set a time-frame for how long you will spend on each group. If one group fails, try the next. It it succeeds, keep pushing it to get as many members as possible.
