I suggest creating a paid Facebook group and charging members a monthly membership fee.

You don't even need it to be too many people- target a membership of around 300 when you get started.

Create great content and offer inside info around your core topic. Interview experts, set up AMAs on the private Facebook group, have weekly accountability threads- basically any information that will improve the members' skills. Often you won't even have to rack your brain- your members will tell you what they want the most.

Keep engagements level high and slowly open the gates as you see people getting value out of the group.

To ease your admin burdens you can appoint a few managers in the paid group, and give them a share of the revenue.