Why not make it static? Set it so virtually no one can post (ultra high karma, or 100 years on reddit). But, make useful resources very available as read only. Then, direct users to here or discord if they want or need more information. The sub essentially becomes a reference.
So first there are some mods who do not want to leave, and are going to do their best to keep it operating, but the bigger thing is reddit will not let us do that, they are forcibly taking control of subs that are doing things like going nsfw, private, or restricted by removing the mod team and placing their own.
who cares? it’s your subreddit, fight with reddit over it, make it read only.