The account who sent the negative trust is the only one who can change it. It was rather recent (August 2023), I dont think you are going to get anything fruitful right now. Obviously, defrauding a campaign by enrolling alt accounts is a grave mistake because you are stealing from the campaign stakes that would be meant for someone else.

Dont take the easy way out of creating a new account but instead be active on the forum and avoid any campaigns for now. After maybe 6months, appeal for a review of the tag.

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Tough luck though, I doubt they would remove it. But you deserve it for what you did.