Focus your efforts on those you are trying to reach, rather than just on those you are trying to keep.
Listen to outsiders for answers, not questions. Listen to outsiders and make adjustments.
Churches are full of ’insiders’ even though most of them start out as ‘outsiders’. If you don’t listen to outsiders you will be driven by the complaints and demands of insiders and ultimately the amount of people you reach will dwindle.
Watch them and listen to them and they’ll tell you what they think and want. Then figure out how to use that information. Don’t be so concerned about keeping the people you’ve got that you neglect the people you are trying to reach.
This requires you to admit that you don’t have all of the answers.