Hey jayce213!,
Thanks for reaching out and meeting us here on Apple Communities!
Sounds like you've got AirPods that've been having some difficulties with the mics lately. We can understand the need to get those working and we'll do everything we can to help.
Although you've done a number of great steps, let's cover anything you haven't yet from If your left or right AirPod isn't working.
In the meantime, you mentioned the mic not working on FaceTime specifically, does this happen in other apps as well or just FaceTime?
We'll wait to hear back from you.
Regards.