Just got a promo offer (targeted I reckon) for extra Elite nights to maintain Diamond (guess I'm low on stay count so far, haha).

"Register now for your exclusive offer and earn Bonus Elite Night Credits on your next three stays by 23 May 2024, up to 7 nights per stay. These make every night you stay count twice, getting you closer to maintaining your Diamond Elite status for ‍2‍0‍2‍5‍ and earning your next Milestone Reward!*"

It's limited to 3 stays of max. 7 nights each so a total of extra 21 qualifying nights you can earn (or less if you have shorter stays)

Works alright for me with 6-8 nights planned in the promo period and may push me up to reach another milestone award, but won't make me Diamond yet.