Assess Strengths & Opportunities for Improvement. Stop guessing what's "going on." We define issues and strengths clearly for you.
I wish I could write that your career success is all about expertise. If you are visiting this site, you are right to suspect that communication skill has just as much impact on your career. I'm glad you are thinking about your speaking style.
How fast you speak, whether you sound or look confident, being clear and concise, enunciating and intoning with authority, stammering, pausing enough -- these are changeable speaking styles.
Truly reading and connecting with your audience, being clear and persuasive, conveying what you know with authority, warmth, and interaction -- these are presentation skills that you need to succeed.
Your career, even interviewing skills, are all about communication skill. You've seen that again and again, haven't you?
Don't wait for success. Work with people who know how to find your best speaking style and make changes right away.
Get Detailed Coaching on using your strengths to your advantage and fixing quirks and habits you don't want.