The best way is always to get promoted/transferred within your current company. Make it known within your company that you would now like to be considered for marketing positions. Typically candidates who just received their MBA are considered, at least at the larger companies. Some employers will also recruit directly out of MBA programs at the better schools for marketing.
Recruiters will not be likely to be able to help you because we generally have to look for candidates who currently have that background/experience.
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