Hi there! For social media marketing professionals I would post a job on this site: "https://workmonger.com/ The founder, John Troy, has done a lot of networking to build both the client and freelancer based among education professionals. It's a site for non-teaching jobs in the field of education. I've been in that field for 10+ years and most people I know with active LinkedIn profiles are connected to him. You may also want to reach out to him on LinkedIn to discuss your project. He may have a team that can give you more high touch support to find the right person.
If you have any other questions about this project, or others, I'd be happy to do a call.