Run a command when a specific message is entered in chat?

I'm trying to make a survival, commands-off-friendly way to trigger the load function whenever. If I could just figure out how to make it trigger whenever I need, I would be set to go. Right now, the only way I can do that is to do [Esc], Open to LAN, Commands On, datapack disable, datapack enable, relog. And I don't really want to do that every time, because I'm planning on resetting it a lot.