[cynusx]

While there are very technical elements to sales (prospecting, funnel management, pipeline review, sales compensation design) that can be measured and tracked, they are relevant for managing salespeople but not for the sale itself.

A sale happening or not depends almost exclusively on whether you can get your counterparty to trust and like you.

The first thing you should focus on is improving your emotional intelligence as this is pretty much the only skill that matters for a successful sale.

Although tons of people believe that you are either born with it or not, I think that EI is highly trainable (unlike IQ) and progress in learning it is scientifically measurable. (except if mental conditions are present like autism or psychopathy)

You probably want to start with doing the EQ-i test to find out where your gaps are. Specifically the metric on personal relationships is highly relevant to improve as soon as possible.

Then you can read great negotiation books like never split the difference and books on sales like the challenger sale.

The theory is not really useful until you've mastered the basic EQ to understand how to execute them.