@Suzanne209 I learned the easy solution to this issue of extending the stay. All you have to do is submit to your guest are request change the check-out date, you input the date change in the place provided, submit to your guest. Guest checks the red click box Accepting your request and it is done. I learned this back when COVID hit and I went monthly and never looked back.
But as Airbnb changed its guidelines for Super Host criteria I thought then that a Host could be a victim of her own success by achieving a 100% occupancy and Airbnb had not even thought of that happening. All the while the vacation rental market has died and the extended stay market of the Travel Work world we now live in is ignored.
Listings like your make real money for Airbnb and they do not seem to do the math to appreciate what us monthly stay hosts have created. They should have a separate rating reviews guidelines for the monthlys which would address the lodging questions in a more appropriate way suited to the nature of the rental agreement.
Like you I have been bumped from Super Host for the same reason. And my guests do not feel they are obliged to respond to the review questions because they are renters not vacationers.
Anyway hope this fix is useful to you. If CS new anything about the platform they could have told you that you can just change the check-out date yourself anytime. Remember you are just changing that date, with same start date of the reservation itself is not changed.
Susan