As others have already mentioned, your trust feedback should not prevent you from becoming a more active or participating member of this community. The fact that your trust rating is low with some members does not mean you aren't trustworthy; it just means that there have been some concerns raised about your behavior or conduct, and it can be changed if you work hard to improve it.

You haven't contributed much to the forum in recent months - more than a year has passed since your last post - and although there are many good reasons why you might not have posted in so long, this is a clear indicator that you are not being an active member of the community and this is one of the main reasons why you cannot participate in signature campaigns or other forms of advertising on bitcointalk. Every campaign manager will have a different set of rules for their campaigns, but the majority will require that you post regularly on bitcointalk and will be looking for the same thing: a high-quality posts with good content. Your trust rating has very little to do with this.