Industry insider Christopher Dring has heard that Microsoft plans on making more Xbox Series X consoles available to the public this holiday season. The restock comes right before Forza Horizon 5 and Halo Infinite will be launched on the platform.
https://www.notebookcheck.net/Industry-insider-suggests-that-Xbox-Series-X-supply-could-get-a-lot-better-in-the-coming-weeks.576068.0.html