A man reaps what he sows. We've been picking fruit from trees we didn't plant. If you visit apple country, you will occasionally see a field where all the trees have been cut and the land is being prepared for new ones. For sufficient fruit to be picked, new seeds must be intentionally planted. Volunteer plants won't generate sufficient fruit for future needs.
Church growth is fairly complex, and involves several different dynamics.
Therefore, specific plans must be laid to achieve desired ends. A church must begin the process in prayer. Pastor and people must seek God's will for the future. God reveals his will to honest seekers. Learn everything you can about the factors that limit growth or make growth possible.