✔ 最佳答案
Go for continuing education and improve your knowledge to strengthen your skill, then your wish may come true after. Some certificates (administration course, secretary course, and other business course) are very useful for you to "sell" yourself to other industry.
With 4 yrs sales exp, you can go for many industries but is just that you maybe lack of higher educational background. If you do have, you could try for supervisory grade and that should have at least $15,000 or more.
Good Luck and Best Wishes. :P