I don't think your native language is english. In regards to your question, positive confidence can be reached by many ways:
https://www.healthyplace.com/blogs/buildingselfesteem/2014/03/10-ways-to-feel-positive-confident/
I like this one:
If you mean how to get positive trust, well don't aim at getting positive trust. You should earn trust and not actively chase it. Just spend your time on the forum, learn from the forum and if you have any skills you can sell those skills on the marketplace.