Hi @IniobongNkanga-8038,
Thank you for posting in this community.
1.Please go to your SharePoint Admin center to check if there is a deleted site in the deleted sites. The deleted site will be put into the recycle bin first to prevent you from deleting sites by mistake. You can choose to delete the site permanently. Clear your browser cache and try creating the site again.
2.If your permanent delete button is in the disabled state, you can try to force a delete using SharePoint Online Management Shell.
Connect-SPOService -Url https://contoso-admin.sharepoint.com
$DeletedSiteCollURL = "https://contoso.sharepoint.com/sites/May"
#Remove Deleted SharePoint Online Site Collection permanently
Remove-SPODeletedSite -identity $DeletedSiteCollURL -Confirm:$false
If the answer is helpful, please click __"Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".__Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.