Confidence vs. humility

I am realizing that I don’t get great results with my business because I am not talking with authority. I don’t know what the underlying thought is. Something like “I want to appear humble”. But I’m not sure, it is not a conscious thought, more a general stance that shows in my appearance. Should I just use “I want to appear humble” in my model? And then transform it slowly in something like “I want to appear” and then “I want to appear with authority”?
Can you point me to a ressource around confidence?
Thank you.