This question has been asked before: https://community.airbnb.com/t5/New-Hosts/How-Do-I-Get-Invitation-To-Super-Strict-Cancellation-Polic...
Airbnb will typically invite a host to use the Super Strict Cancellation Policy if they meet the following criteria:
- Marquee property, usually with a high rate (e.g. $10,000/night)
- Property is subject to serious seasonality.
- Good track record with both guests and Airbnb.
Super Strict 30 and 60 day require the host to agree to an increased fee structure (typically an additional 5% increase).