Some members have successfully changed their usernames. Most of the names that were changed were high-ranking members. I assume that they gave a genuine reason for the change of name request and in most cases, it is associated with maintaining privacy. You have made about 84 posts, that's big and you have earned some merit, so it might not be easy to abandon the account. It will be better to create a new account but if you are really desperate to change your user name you can send PM to moderators and keep waiting for their response. There is no time prediction for their response, you will have to wait.