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How to end a cover letter
Get a little more personal.
Think deeply about why you want this job. What true statement can you make about why you think this is the right place for you to work, and why the company should hire you? Authenticity is key when it comes to helping your cover letter stand out from everyone else's.
There's no need to get too personal or emotional, but a heartfelt line about why you're right for the job is appropriate. Saying something like " the chance to join your office would be a tremendous opportunity " isn't going to hurt your chances.