People might not report their abusers because their abusers are well liked (they always are, that's how they get away with it) or because they're not sure they're being abused or if it's all in their head (they're being gaslit) or because the abuser's got dirt on them and might retaliate, or for all sorts of other reasons. These are all barriers to reporting.
NAME THEM AND TALK ABOUT THEM ON YOUR SITE. Then people will notice that they have their own barriers and that helps to dismantle them.