There are solutions (already mentioned above):
- Self-moderated threads: to avoid spams (by deleting them).
- Lock threads after creating them (then unlock when you want to edit or update).
If I was you, I would go to self-moderated threads because it is a dead thread when I lock it.
Besides that, I have one more for you:
Threads, without replies (and are not pinned ones) will be gradually decreased in display positions. The default display position is based on newest replies and / or
bump score (depends on which boards, only 4 boards for now have bump score applied by default). Without replies/ bump (only 1 time per 24 hours), your thread will be hidden, and no one from the community will see them, after several weeks.
And most of boards or child boards on the forum are crowded and actively, despite of some local boards.