One strategy I have read that has worked for some hosts who’d been waiting for payments dating back months, getting nothing but a run around, was getting in touch with the past guests whose bookings you haven’t been paid for, explaining that Airbnb has never paid you out for their booking, and asking them if they would be so kind as to contact Airbnb, asking what happened to the $ they had paid to Airbnb for their booking that was completed months ago, as the host says she never got paid.
Apparently Airbnb is much more responsive to guests asking what happened to their money, than it is to hosts whose money they are sitting on.
Of course, you should first make sure your payout info is all correct, that you’ve filled out whatever tax info is required, etc. as some payment issues can be attributed to hosts failing to update or enter required info.