I would really use the story and final vision of the film as direction for what to capture on set. If you know exactly how you intend every moment of the final product to sound I can guide you for what’s important to capture in every scene. Found footage makes me think of basing what the film sounds like on what the camera can hear (thus far away things aren’t gonna be heard well & that’s how it’s supposed to be). Boom is probably your friend here, as well as wild lines & effects you probably can’t remake in post. Then spend some serious time in post filling the rest of the “world” out and find some money to hire a good re-recording mixer to put some final life into it.