She told me that there were two types of good salesmen. One is the kind of salesman that could sell ice to an eskimo. It was all about the pitch and sales techniques.
But she also brought up another type of salesperson, and this was the person that "bought the pitch" themselves. An example of this is a vacuum cleaner salesman I met later in life, and no it wasn't Claude.
This guy loved the vacs he was selling so much, he actually bought 3 of them for himself. I never quite understood why anyone would want 3 vacs, but he did buy 3 of them with his own money. He bought his own sales pitch.
She taught me that the salesperson that buys the pitch themselves is the absolutely the best sales person. And this guy was a very good salesman as his honest enthusiasm was picked up on by his prospects.
You can read all sorts of advice about how to sell things, but instead of just becoming able to sell ice to eskimos, you may want to also try selling things that you love and would buy yourself. It's probably a lot easier for you to sell something you'd buy yourself.