Start with a clear purpose written in one sentence. If your server tries to be everything, it becomes nothing specific enough to invite friends.
Create a small set of channels: announcements, general chat, and a help desk. Add more only when conversations repeat.
Welcome every new member with a short pinned post: rules, expectations, and where to ask questions.
Growth is not only member count—retention matters. Run small events, highlight good posts, and keep moderation kind but consistent.