This is a question that is impossible to answer because that answer is unique to each individual and their situation. But there are certain fundamental mistakes people make that will ruin them no matter how hard they try. We get into some of these issues here.

Watch the video here: https://www.youtube.com/watch?v=AfoPRs8Zz_Q

The question, "what is the most important key to being successful at sales?" was asked and I get into a long diatribe as I elaborate on what I think the answer is.