Board Thread:Support Requests - Community Management/@comment-33230496-20180903222218/@comment-9605025-20180904004511

Well, aside from manually closing each thread, you can use ArchiveBoards to close and entire board or LockForums for individual threads. Based on what you described, it sounds like you would be interested in LockForums. In case you are interested, there is an analogous script for blogs, LockOldBlogs.