How to confirm the amount of active forum members into revenue? Urgent Advice needed

Dear All Professional.

I have got a Sports forum on:

I have got an issue here, I want to find a way on how to make money from it, can any professional suggest how I could achieve this?

The average visitors spend around 23 mins on the website reading various posts, I don’t know if that makes a difference.

I would welcome any recommendation here.

Thanks and Regards to you all!