Hi @Deepaklal-FT ,
Thank you for posting query in Microsoft Q&A Platform.
To delete your organization, you need at least Basic access and Project Collection Administrator permissions. Click here to know more deleting Organization in DevOps.
Please reach out to your Project collection administrators and get the job done. To know to steps to find project collection administrators please follow below link.
How do I find the Project Collection Administrators?
Please Note, Azure Subscription and DevOps subscription are two different things. Hence have some roles in Azure will not have any impact on DevOps management side.
As suggested by @AnuragSingh-MSFT feel free to post any DevOps related queries in respective platforms.
Hope this helps. Please let us know if any further queries.
-----------
Please consider hitting Accept Answer
button. Accepted answers help community as well.