Hi, I need a tool to schedule social media posts (tiktok, instagram, twitter, facebook, possibly linkedin) for a dozen or so accounts at once (I'm going to open a marketing agency and would like to have all the stuff and accounts on hand)

In addition, it would be nice if such a tool had some kind of integration with automation tools (prefers n8n.io, however, it can be other however it also has to be self-hosted)