@Inna22
Yes...some Hosts I work with that have large properties have the same limitation. Airbnb added this 16 guest limitation during COVID and as part of their anti-party program, but was supposedly going to lift that?
https://www.airbnb.com/resources/hosting-homes/a/tips-to-help-prevent-parties-at-your-property-223
The Hosts I'm working with usually send a special offer if the booker wants more than 16 guests. Just have to be careful to add nightly rate, cleaning fee, and any addl guest fees you have to the total on the offer.
The guest will show 16 guests on the reservation, and then you'll have to adjust any messages sent to indicate the correct number.
You could ask Airbnb to remove the limitation on the listing, but not sure that will happen.