...snip... the negative trust in my profile is affecting me on the forum; It's forcing me to create an ALT account and use it, which is also not allowed in this forum. Then what should I do?
Can all this be reverted again?
It is allowed. You can create hundred of thousands of accounts and nobody would object. But when you enrolled all of your alt in the same campaign that's where you fuc*ked up mate! Didn't you read the rules of the bounty/campaigns before joining? All of them clearly states no multi accounts. You have violated their terms not only once but on multiple occasions with multiple account.
Unfortunately there is no going back from this. Consider those red tags permanent, because there is no anyone would be interested in removing them.