There are a few things you should avoid doing before applying for a loan, as they could negatively impact your chances of getting approved. For example, don't apply for new credit cards or lines of credit, as this can lower your credit score. You should also avoid making any large purchases on credit, as this could increase your debt-to-income ratio and make it more difficult to get approved for a loan. Finally, make sure to keep up with your existing payments so that you don't have any late payments on your record. Doing these things will help improve your chances of getting approved for a loan.