Hello,
We apologize for the issue you are facing regarding your username change. To change your username from "ved prakash -6140" to "priyanka sood," you will need to open a ticket with the Rank Math Support team. Before doing so, please check if the desired username is available by visiting this URL and replacing username with your desired username:
https://rankmath.com/support/ sood/
If it returns an "Oops! That page can’t be found" error, it means the username is available for use. If it shows a profile page, then the username is already taken.
If you prefer to delete your Rank Math account instead, please let us know, and we can assist you further with that process.
Thank you for raising this concern! If you have any more questions or need further assistance, feel free to reply to this ticket, and a human agent will take over.

Sources:
How to Change Your Username in Rank Math » Rank Math
Kindly delete our rank math account
Hello,
We can see that the username priyanka-sood is available, do you want us to proceed with changing the username or delete your account?
Please note that when your RankMath.com account is deleted, you will no longer have access to any of your tickets, including this one. You will also not have access to all the Rank Math plugin features, as some of the features require a Rank Math account.
Please confirm that you still want to delete your RankMath.com account. This action is irreversible.
We are looking forward to hearing back from you.
Hello,
Thank you for contacting Rank Math today.
As requested we have made changes to the username and you can see the same from here: https://rankmath.com/my-account/edit-account/
Don’t hesitate to get in touch if you have any other questions.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.