Keeping the community nourished in the form of value to the members. This requires time and effort especially when first starting out. Community will not grow when they see no value or do not feel comfortable engaging. Once it catches on with engaged members, it can become easier because everyone is then contributing more (and they will start inviting other like minded people).
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When there are too many similar communities on different platforms and people have more options and hard for them to decide to stay. Trends and people change.
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Degeniverse