Here is something worth sitting with for a minute.
The people following you on Facebook are not the same as the people following you on Instagram. Even if some of them overlap.
They found you at different times. Through different content. For different reasons. And they show up differently once they are there.
Your Instagram audience is often earlier in the relationship. They found a Reel or a post, something caught their attention, and they followed. They tend to engage quietly. Saves, views, the occasional DM when something really lands.
Your Facebook audience is often older in the relationship. They have been around longer. They know you a bit more. They will comment, share, and have a conversation in public in a way Instagram followers often won't.
Your LinkedIn audience followed you because of your expertise or your point of view. They are there to think. They engage when something challenges them or confirms something they already suspected but hadn't heard said out loud.
So when you take one piece of content and post it identically across all three, you are treating three different people like they are the same person. And they can feel that even if they cannot name it.
Repurposing well means writing with a specific person in mind each time. Not a vague ideal client. The actual person who is most likely to be reading that platform on a Tuesday morning.
Think about your own platforms for a second. Do you actually know who is showing up in each place and what they need from you there?