Consistency beats volume. For most communities 3–5 posts a week keeps the space active without overwhelming members. Pick a sustainable cadence and protect it — a predictable rhythm trains members to check in.
Low-effort, high-participation posts — polls and open questions — because they only ask for a tap or one line. Rotate them with wins, behind-the-scenes and value drops so the feed never feels repetitive.
You can’t reply to everyone at 10K+, so build rituals that run themselves (weekly wins thread, recurring poll), empower moderators, and reply to the highest-signal comments to model the behaviour you want.