I suspect that your comments above concerning the number of people who are saved and the numbers who return to your church after having joined or expressed interest in joning are due to your experience in your own church.
I offer this next comment as a practical question concerning the day to day running of your church:
Is the problem that your church is boring?
My minister's attitude, which he has publicly stated, is:
"If you don't have fun at church, don't go!"
OTOH........
to comfort the Afflicted.......
and.....
to afflict the Comfortable.