When you have an amazing credit score, life looks pretty awesome – getting a good rate on a new line of credit or getting a new apartment would be incredibly simple. So, why not just relax and not be as proactive as you were while you were establishing credit? Because this could be one of the biggest mistakes that people with amazing credit can do and before you know it, you are trying to rebuild your score again. . Especially since it does not take as long to ruin a good score. Well, here are 6 Credit Mistakes Even Those With Amazing Credit Make.