Cover letters for other industries accomplishments are a nice complement to the resume, but if the letters lack achievements interviewers tend to overlook that fact. On the flipside, sales cover letters have to include accomplishments or else interviewers may overlook your candidacy. Don't let that happen to you. I can write or rewrite your sales cover letter. I am a sales resume writer who is certified and has written two books on job interviewing.
The challenge many "do it yourselfers" come across is rewording accomplishments so they sound completely different than in the information on the resume. That takes talent, a skill you probably don't have time to master. Email your existing resume and/or cover letter for a price quote. Or complete my online form for a sales resume quote.