It's not about self-help, it's about practice, like normal atheletes

 Practice practice practice.

It's about discipline, timetable, and practice. You practice talking to people, practice running, practice writing, practice reading, practice maths, practice negotiating skills. Everything is a practice. 

It's not about self-help, it's not about lifehacks. It's learning to do something decently well one time, just for once. And repeating it over and over and over again until you get better at it, until you know what you're doing. Until you're comfortable doing it without paying attention at all.

If boxers and runners and swimmers and spelling people and interviewees get better with practice, so does being disciplined, writing on a daily basis, cooking, running, talking to people, literally everything else. If you want to get better at something, doing it decently well once, and repeating it for a thousand times is all that matters.

In the end, that's all that matters, no? You have to keep trying, trying and trying, until you're not rejected. And you get better at things naturally.

Motivation is going to get you only 5% far, even if that much, really. Discipline/habit and structure is what will get you the rest of the way. Just keep practicing more.