The author of 'Smart, Not Loud' recommends that every employee has a 'Yay Folder' to boost their productivity and motivation.

Jessica Chen describes her upbringing as a "quiet culture," where she was taught to focus on accomplishing her tasks, achieving her objectives, and avoiding any disruptions.

The CEO of SoulCast, a communication training agency, discusses in her new book "Smart, Not Loud" how not speaking up for herself has impacted her in the workplace.

"I was never taught the significance of being proactive or how to communicate assertively."

Silently completing tasks is not an effective strategy for advancing in the workforce after several years.

""Being able to showcase myself was crucial, as well as effective communication and visibility, which were both rewarded," she wrote."

In her book, she presents several strategies for celebrating your successes and using them to secure promotions without coming across as boastful or arrogant.

One you can do in seconds: create a "Yay Folder."

'Write down your accomplishments as they happen'

A "Yay Folder" is a designated location for storing emails of appreciation. If your boss commended your excellent performance in a staff memo or a client expressed satisfaction with your work, save those emails in your "Yay Folder."

""Your 'Yay Folder' is a valuable resource for showcasing your achievements and searching for examples to boost your confidence at work," Chen writes."

Stefanie Fackrell, a HR consultant with experience at Google and Nvidia, advised CNBC Make It earlier this year that this advice can also be applied when enhancing a resume.

"Record your achievements as they occur so you'll have a record of them," she advises.

When it comes time to refresh your LinkedIn, resume, or write a cover letter, you can easily access a record of all your accomplishments.

To become a successful and confident communicator, enroll in CNBC's online course, "Become an Effective Communicator: Master Public Speaking." Our program will teach you how to speak clearly and confidently, manage your nerves, choose the right words and body language, and make a great first impression. Sign up now and use code EARLYBIRD for a 30% discount through July 10, 2024.

Sign up for CNBC Make It's newsletter to receive tips and tricks for success at work, with money and in life.