Everyone's current status will last until March 2023.

To have diamond until March 2024, you need 21 stays or 42 nights in the calendar year 2022.

Stays don't roll over so your 11 stays won't count towards this. 2021's nights will roll over. You have at least 11 nights so you need at most 31 nights, or the full 21 stays. (Remember some of the nights currently showing in your account may have been stayed in 2020 - these won't roll over.)

Points expiration is separate to status. If you don't earn any points for 24 months they will expire.