Do you have specific examples of content that is being posted to inappropriate subverses? e.g. shitposts to ? Moving content that is in the wrong place is the only way to rectify this. Make suggestions, don't just complain.
If it isn't a matter of content in the wrong subs, but just a higher proportion of shitposts than usual, then block the shitpost subs and move on.
(post is archived)