As announced at Ignite 2022, the ability to rename your SharePoint domain URL is generally available to organizations that have less than 10,000 total sites (including OneDrive and SharePoint sites).
When this will happen
Standard Release: This capability is available now to organizations that have less than 10,000 total sites (including OneDrive and SharePoint sites).
Message ID: MC462923
Published: 2022-11-09
Updated: 2022-11-09
Product: OneDrive, SharePoint
Platform: Online, World tenant