As per the the tweet:
"Thanks to your support, Trailblazer, Honkai: Star Rail has won the "TGA 2023 Best Mobile Game" reward.
To thank Trailblazers for your continuing support, we will be gifting Stellar Jade ×1600 via in-game mail on December 9 at 00:00 (server time).
We are glad to spend this time with you, and may this journey lead us starward.
※ The reward mail must be claimed before the end of Version 1.5. All Trailblazers at Trailblaze Level 4 or above will be eligible to claim the reward."