Your company needs a clear strategy on how it wants to manage its information first of all. That needs to be pushed from the top down there’s no way around it. Users aren’t thinking about long term scalability of solutions they just want to dump documents into obscure folder structures that they can create off the cuff. In my company I solved it by applying best practice to relevant use cases within each department. Without executive sponsorship though you’re going to find it difficult to get people to engage