Can anyone help me with this?
Did you read the postings from 2 years ago? Only the people who gave you negative trust can take it back, and it does not looks like they are inclined to do so.
Even though you probably like that account name a lot you should really consider using a different name if you want to avoid the negative trust. There just have been too many impostors on this forum, so the preventive negative trust is quite understandable.
Since you're still a newbie with very few postings, you would not even lose significant activity points or membership rank by giving up this account.
Onkel Paul